Monitoring of diffuse CO2 degassing at NERZ, NWRZ and NSRZ volcanic systems of Tenerife, Canary Islands

One of the main volcano-structural and geomorphological feature in Tenerife (2,034 km2) is the triple rift system, formed by aligned of hundreds of monogenetic eruptive products of shield basaltic volcanism. At the intersection of this triple rift system rises the Teide-Pico Viejo volcanic complex. These volcanic rifts are considered as active volcanic edifices. The North East volcanic Rift Zone (NERZ, 210 km2) form a main NE-SW structure. The North West volcanic Rift Zone (NWRZ, 72 km2) is oriented in NW-SE direction and the North South volcanic Rift Zone (NSRZ, 325 km2) comprises a more scattered area on the south of these monogenetic cones. The most recent eruptive activity of Tenerife has taken place in these rift systems. NERZ host the fissural eruption of Arafo-Fasnia-Siete Fuentes (1704-1705). NWRZ host two historical eruptions: Arenas Negras in 1706 and Chinyero in 1909. Recently the eruption of Boca Cangrejo (1492) has been added to the historical register through 14C dating. NSRZ does not host historical volcanism, although it is recent, up to 10,000 years old.In order to provide a multidisciplinary approach to monitor potential volcanic activity changes at the NERZ, NWRZ and NSRZ, diffuse CO2 emission surveys have been undertaken since 2000, in general in a yearly basis, but with a higher frequency when seismic swarms have occurred in and around NWRZ volcano. Each study area for NERZ, NWRZ and NSRZ comprises hundreds of sampling sites homogenously distributed. Soil CO2 efflux measurements at each sampling site were conducted at the surface environment by means of a portable non-dispersive infrared spectrophotometer (NDIR) LICOR Li820 following the accumulation chamber method. To quantify the CO2 emission rate from the NERZ, NWRZ and NSRZ a sequential Gaussian simulation (sGs) was used as interpolation method.The diffuse CO2 emission rate for the NERZ ranged from 532 up to 2823 t d-1 between 2001 and 2020, with the highest value measured in 2020. In the case of NWRZ, the diffuse CO2 emission rate ranged from 52 up to 867 t d-1 between 2000 and 2020, with the highest value measured in one of the surveys of 2005. Finally, and for NSRZ, the diffuse CO2 emission rate ranged from 78 up to 819 t d-1 between 2002 and 2020, with the highest value measured in 2019. The temporal evolution of diffuse CO2 emission at the NERZ, NWRZ and NSRZ shows a nice and clear relationship with the volcanic seismicity in and around Tenerife Island, which started to take place from the end of 2016. The good temporal correlation between the volcanic seismicity and the increase trend observed in the time series of diffuse CO2 emission rates at NERZ, NWRZ and NSRZ is also coincident with the observed increase of diffuse CO2 emission rate at the summit crater of Teide. This work demonstrates the importance of performing soil CO2 efflux surveys at active rift systems in volcanic oceanic islands as an effective geochemical monitoring tool.

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Diffuse CO2 degassing monitoring of the Tenerife North–South Rift Zone (NSRZ) volcano, Canary Islands

10.5194/egusphere-egu2020-12067 ◽

2020 ◽

Author(s):

María Cordero-Vaca ◽

Carolina A. Figueiredo ◽

Nicole L. Czwakiel ◽

Eleazar Padrón ◽

Gladys V. Melián ◽

...

Keyword(s):

Canary Islands ◽

Rift Zone ◽

Emission Rate ◽

Interpolation Method ◽

Graphical Analysis ◽

Sequential Gaussian Simulation ◽

Average Value ◽

Effusive Activity ◽

Background Population ◽

Tenerife Island

Tenerife (2,034 km2) is the largest of the Canary Islands and the North South Rift Zone (NSRZ) is one of the three active volcanic rift-zones of the island. The NSRZ (325 km2) is characterized mainly by effusive activity of basaltic lavas forming spatter and cinder cones and comprises 139 monogenetic cones representing the most common eruptive activity occurred on the island during the last 1Ma. In order to provide a multidisciplinary approach to monitor potential volcanic activity changes at the NSRZ volcano, diffuse CO2 emission surveys have been undertaken since 2002. This study shows the results of the last soil CO2 efflux survey undertaken in summer 2019, with &#8275;600 soil gas sampling sites homogenously distributed in the study area. Soil CO2 efflux measurements were performed at the surface environment by means of a portable non-dispersive infrared spectrophotometer (NDIR) LICOR Li820 following the accumulation chamber method. Soil CO2 efflux values ranged from non-detectable (&#8275;0.5 g m-2 d-1) up to 30 g m-2 d-1, with an average value of 2.6 g m-2 d-1. In order to distinguish the existence of different geochemical populations on the soil CO2 efflux data, a Sinclair graphical analysis was done. The average value of background population was 2.1 g m-2 d-1 and that of peak population was 18.5 g m-2 d-1, representing the 97% and the 1% of the total data, respectively. To quantify the total CO2 emission rate from the NSRZ volcano a sequential Gaussian simulation (sGs) was used as interpolation method. The diffuse CO2 emission rate for the studied area was estimated in 2019 in 819 &#177; 18 t d-1, ranging from 466 to 819 t d-1 between 2002 and 2019, with the highest value measured in 2015 (707 t d-1). The temporal evolution of diffuse CO2 emission at the NSRZ shows a clear relationship with the volcano seismic activity in and around Tenerife Island, which started to taking place from the end of 2016. This study demonstrates the importance of studies of soil CO2 efflux at the NSRZ volcano of Tenerife island as an effective volcanic monitoring tool, especially in areas where there is no visible degassing (fumaroles, etc.)

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Surface diffuse degassing monitoring of the Tenerife Northeastern Rift Zone (NERZ) volcano, Canary Islands

10.5194/egusphere-egu2020-11604 ◽

2020 ◽

Author(s):

Lucía Sáez-Gabarrón ◽

Jazlyn Beeck ◽

Sian Reilly ◽

Mar Alonso ◽

Víctor Ortega-Ramos ◽

...

Keyword(s):

Interpolation Method ◽

Graphical Analysis ◽

Point Of View ◽

Sequential Gaussian Simulation ◽

Contour Maps ◽

Average Value ◽

North East ◽

The North ◽

Tenerife Island ◽

Total Data

The North East Rift volcanic Zone (NERZ) of Tenerife Island is one of the three volcanic rift-zones of the island, oriented NW-SE (NWRZ), NE-SW (NERZ) and a more scattered area on the south (NSRZ). From a volcano-structural point of view, NERZ is more complex than NW or NS rifts due the existence of Pedro Gil stratovolcano that broke the main NE-SW structure. Pedro Gil Caldera was formed&#160; 0.8&#160; Ma ago by a vertical collapse of this stratovolcano. The most recent eruptive activity along the NERZ took place during 1704 and 1705 along a 13 km of fissural eruption of Arafo-Fasnia-Siete Fuentes. Diffuse CO2 emission surveys have been undertaken in a yearly basis since 2001 in order to provide a multidisciplinary approach to monitor potential volcanic activity changes at the NERZ. The aim of this study is to report the results of the last soil CO2 efflux survey undertaken in summer 2019, with 639 measuring sites homogeneously distributed in an area of 210 km2. In-situ measurements of CO2 efflux from the surface environment of NERZ were performed by means of a portable non-dispersive infrared spectrophotometer (NDIR) following the accumulation chamber method. Soil CO2 efflux contour maps were constructed to identify spatio-temporal anomalies and to quantify the total CO2 emission using the sequential Gaussian simulation (sGs) interpolation method. The CO2 efflux values ranged from non-detectable (0.5 g m-2 d-1) up to 72,3 g m-2 d-1, with an average value of 10,9 g m-2 d-1. Statistical-graphical analysis of the 2019 data show two different geochemical populations; background (B) and peak (P) represented by 70.4% and 1.9% of the total data, respectively. The geometric means of the B and P populations are 0.4 and 4.3 g m-2 d-1, respectively. The diffuse CO2 emission rate was estimated in 2,205 t d-1. Studying the long-term variations on the diffuse CO2 emission since 2001, two main pulses are identified: one in 2007 and a second one sustained over time between 2014 and 2019. Enhanced endogenous contributions of deep-seated CO2 might have been responsible for the higher CO2 emissions values observed during those pulses. The 2014-2019 pulse appears to be related to the seismic activity that started taking place in Tenerife at the end of 2016. This study denotes the importance of soil CO2 efflux surveys at the NERZ volcano of Tenerife Island as an effective volcanic monitoring tool.

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Diffuse He degassing monitoring of the Tenerife North-western Rift Zone (NWRZ) volcano, Canary Islands

10.5194/egusphere-egu2020-11646 ◽

2020 ◽

Author(s):

Guillermo Recio ◽

Eleanor Dunn ◽

Yasmin McInally ◽

Nemesio M. Pérez ◽

Cecilia Amonte ◽

...

Keyword(s):

Spatial Distribution ◽

Rift Zone ◽

Soil Gas ◽

Sequential Gaussian Simulation ◽

Volcanic Complex ◽

Concentration Data ◽

Entire Area ◽

North West ◽

Geochemical Properties ◽

Helium Emission

Tenerife (2034 km2), the largest island of the Canarian archipelago, is characterized by three volcanic rifts oriented NW-SE, NE-SW and N-S with a central volcanic complex, Las Ca&#241;adas Caldera, hosting Teide-Pico Viejo volcanoes. The North West volcanic Rift Zone (NWRZ, 72 km2) of Tenerife is one of the youngest and most active volcanic systems of the island, where two historical eruptions have occurred: Arenas Negras in 1706 and Chinyero in 1909. Diffuse degassing studies has become an important volcanic surveillance tool at those volcanic areas where visible manifestations of volcanic gases are absent, as in the case of NWRZ. Mapping soil gas emission along volcanic structures can provide a better understanding of the processes occurring at depth and allows monitoring the spatial distribution, magnitude and temporal evolution of the surface gas emissions. The geochemical properties of He, minimize the interaction of this noble gas on its movement toward the earth&#8217;s surface, and make this gas an almost ideal geochemical indicator of changes occurring in the magmatic plumbing system of the volcano (Padr&#243;n et al., 2013, Geology 41(5):539&#8211;542). Since 2014, surface He emission surveys have been performed once a year as an additional geochemical tool to monitor the volcanic activity of NWRZ. At 345 sampling sites soil gas samples were collected at 40 cm depth and analyzed for He concentration within 24 hours by means of QMS, model Pfeiffer Omnistar 422. The soil helium concentration data were used to estimate the diffusive helium flux at each point, to construct spatial distribution maps by sequential Gaussian simulation and then to estimate the total helium emission in the NWRZ. Helium emission ranged between non-detected values up to 7.2 mgm-2d-1, and the emission rate of the entire area was in the range ~1 &#8211; 45 kg d-1. An increasing trend was observed in the period 2016-2018, showing a good temporal coincidence with a significant increase in seismic activity recorded in Tenerife. The promising results observed in the NWRZ and in other volcanic systems (Padr&#243;n et al., 2013) indicate that soil helium emission monitoring could be an excellent early warning geochemical precursory signal for future volcanic unrest.

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Rn and CO2 geochemistry of soil gas across the active fault zones in the capital area of China

Natural Hazards and Earth System Sciences Discussions ◽

10.5194/nhessd-2-1729-2014 ◽

2014 ◽

Vol 2 (2) ◽

pp. 1729-1757 ◽

Cited By ~ 2

Author(s):

X. Han ◽

Y. Li ◽

J. Du ◽

X. Zhou ◽

C. Xie ◽

...

Keyword(s):

Active Fault ◽

Emission Rate ◽

Active Faults ◽

Soil Gas ◽

Spatiotemporal Variations ◽

Gas Emission ◽

North East ◽

The North ◽

Soil Gas Survey ◽

Soil Gas Sampling

Abstract. The present work is proposed to investigate the spatiotemporal variations of soil gas Rn and CO2 across the active faults in the capital area of China, for the understanding of fault activities and the assessment of seismic hazard. A total of 342 soil gas sampling sites were measured twice in 2011 and 2012 along seven profiles across four faults. The results of soil gas surveys show that in each profile, due to the variation of gas emission rate, the concentrations of Rn and CO2 changed in the vicinity of faults. Spatial distributions of Rn and CO2 in the study areas were different from each other, which was attributed to soil types affecting the existence of Rn and CO2. Compared with 2011 soil gas survey, the increases of Rn and CO2 concentrations in 2012 were related to the enhancement of seismic activities in the capital area of China. Our results indicate that special attention for seismic monitoring should be paid to Xinbaoan-Shacheng Fault and the north east segment of Tangshan Fault in the future.

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Cretaceous lithostratigraphy of North-East Greenland

Bulletin of the Geological Society of Denmark ◽

10.37570/bgsd-2020-68-04 ◽

2020 ◽

Vol 68 ◽

pp. 37-93 ◽

Cited By ~ 3

Author(s):

Morten Bjerager ◽

Peter Alsen ◽

Jørgen Bojesen-Koefoed ◽

Michael B.W. Fyhn ◽

Jussi Hovikoski ◽

...

Keyword(s):

Rift System ◽

Tectonic Event ◽

New Members ◽

East Greenland ◽

Submarine Slope ◽

Geographical Society ◽

North East ◽

The North ◽

Basin Floor ◽

Lower Maastrichtian

An updated and revised lithostratigraphic scheme is presented for the Cretaceous of North-East Greenland from Traill Ø in the south to Store Koldewey in the north. The Ryazanian to lower Maastrichtian succession is up to several kilometres thick and comprises four groups, 12 formations and 18 members. The groups record the tectonic evolution of the East Greenland depocentre on the western flank of the evolving proto-Atlantic seaway. The Wollaston Forland Group encompasses the uppermost Jurassic – lowermost Cretaceous rift-climax succession and contains the Lindemans Bugt and Palnatokes Bjerg Formations; two new members of the latter formation are erected from Store Koldewey. Post-rift Cretaceous strata are referred to the new Brorson Halvø Group and the Home Forland Group. The Brorson Halvø Group (uppermost Hauterivian – middle Albian) is dominated by slope and basinal mudstones of the new Stratumbjerg Formation but also includes fluvio-deltaic and shallow marine sandstones of the revised Steensby Bjerg Formation on northern Hold with Hope and submarine slope apron breccias and conglomerates of the revised Rold Bjerge Formation on Traill Ø. The Home Forland Group covers the middle Albian – Coniacian succession. The basal unconformity records an important mid-Albian tectonic event involving intrabasinal uplift, tilting and erosion, as exemplified by the middle Albian conglomerates of the new Kontaktravine Formation on Clavering Ø. The Home Forland Group is dominated regionally by mud-dominated slope to basinal deposits of the elevated and revised Fosdalen Formation; it also includes lowstand basin-floor fan sandstones of the new upper Albian Langsiden Member. The new Jackson Ø Group (upper Turonian – lower Maastrichtian), records a phase of basin reorganisation marked by a significant fall in sedimentation rate in North-East Greenland, probably linked to rift events in, and bypass to, the central proto-Atlantic rift system. The base of the group is an erosional unconformity on Traill Ø and Geographical Society Ø overlain by submarine slope-apron conglomerates of the Turonian Månedal Formation. The base is conformable on Hold with Hope but is defined by a condensed interval (the Coniacian Nanok Member) that is succeeded conformably by slope and basin-floor turbidite sandstones of the Coniacian–Santonian Østersletten Formation and slope to basinal mudstones of the Campanian – lower Maastrichtian Knudshoved Formation. The new Leitch Bjerg Formation of Campanian slope-apron conglomerates and sandstones in eastern Geographical Society Ø erosionally overlies the Knudshoved Formation.

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Central- and North-East Greenland Rifted Margin Composite Tectono-Sedimentary Element, From Onshore East Greenland to the Greenland Sea

Geological Society London Memoirs ◽

10.1144/m57-2017-15 ◽

2021 ◽

pp. M57-2017-15

Author(s):

Michael B. W. Fyhn ◽

Peter Alsen ◽

Morten Bjerager ◽

Jørgen A. Bojesen-Koefoed ◽

Flemming G. Christiansen ◽

...

Keyword(s):

Depositional Environments ◽

Source Rocks ◽

Rift System ◽

East Atlantic ◽

Petroleum Potential ◽

East Greenland ◽

North East ◽

The North ◽

Marine Sedimentation ◽

Uplift And Erosion

AbstractThe Devonian to lower Eocene Central-East and NE Greenland Composite Tectono-Sedimentary Element CTSE) is a part of the North-East Atlantic rift system. East and NE Greenland geology is therefore analogues to that of the prolific basins on the conjugate Atlantic margin and in the North Sea in many respects. None the less, hydrocarbon discoveries remain. The presence of world-class source rocks, reservoirs and seals, together with large structures, may suggest an East and NE Greenland petroleum potential, however. The TSE was established through Devonian - Carboniferous, Permian - Triassic and Jurassic - Cretaceous rifting interspersed by periods of uplift and post-rift sagging. Subsequently, Paleocene - Eocene magma-rich rifting accompanied the North-East Atlantic break-up. Depositional environments through time varied in response to the changing tectonism and climate. None-marine deposition dominated until the end of the Triassic, only interrupted by marine sedimentation during Late Permian - Early Triassic times. Subsequently, marine conditions prevailed during the Jurassic and Cretaceous. Volumetric series of basalt erupted over most of the CTSE during the latest Paleocene - early Eocene following a significant latest Cretaceous - Paleocene regression, uplift and erosion event. Since the Eocene, denudation pulses have removed much of these basalts uniquely exposing the up to 17 km strata of the CTSE.

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Biomass and distribution of the red octopus (Octopus maya) in the north-east of the Campeche Bank

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315419000419 ◽

2019 ◽

Vol 99 (06) ◽

pp. 1317-1323 ◽

Cited By ~ 1

Author(s):

Otilio Avendaño ◽

Iván Velázquez–Abunader ◽

Carlos Fernández–Jardón ◽

Luis Enrique Ángeles–González ◽

Alvaro Hernández-Flores ◽

...

Keyword(s):

Sampling Site ◽

Sampling Effort ◽

Uniform Sampling ◽

North East ◽

The North ◽

Biological Studies ◽

The Individual ◽

Octopus Maya ◽

Swept Area ◽

Random Method

AbstractThe regulatory framework of the red octopus (Octopus maya) fishery includes total allowable catches (TAC), which are based on studies conducted on the population that occurs in shallow waters. In fact, most of the biological studies of this species refer to the fraction of the population that occupies waters less than 30 m deep; however, O. maya can occur up to a 60 m depth. The aim of this study is to assess the stock of O. maya that occupies waters between 30 m and 60 m deep. Four research cruises were carried out during the closed and fishing seasons, from May 2016 to January 2017. An average of 29 sampling sites were surveyed in each cruise (±2 sampling sites) using a commercial vessel with a uniform sampling effort. In each sampling site, the swept area, the total number of octopuses captured, the total weight of the catch, and the individual weight of octopuses were recorded. Biomass was obtained with four methods: stratified random method, swept area method, geostatistical biomass model, and an unpublished method of weighted swept area. The four methods provided consistent results. The distribution pattern of species was in patches, although before the fishing season started it was more homogeneous. The fraction of the population that occurs between 30 m and 60 m deep consisted mostly of adult organisms, so it could be contributing significantly to the recruitment of the entire population, even to the fraction that is exploited.

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Distribution of petrophysical properties for sandy-clayey reservoirs by fractal interpolation

Nonlinear Processes in Geophysics ◽

10.5194/npg-19-239-2012 ◽

2012 ◽

Vol 19 (2) ◽

pp. 239-250 ◽

Cited By ~ 10

Author(s):

M. Lozada-Zumaeta ◽

R. D. Arizabalo ◽

G. Ronquillo-Jarillo ◽

E. Coconi-Morales ◽

D. Rivera-Recillas ◽

...

Keyword(s):

Interpolation Method ◽

Exponential Model ◽

Effective Porosity ◽

Well Logs ◽

Sequential Gaussian Simulation ◽

Depth Interval ◽

General Point ◽

Petrophysical Properties ◽

Fractal Modeling ◽

The North

Abstract. The sandy-clayey hydrocarbon reservoirs of the Upper Paleocene and Lower Eocene located to the north of Veracruz State, Mexico, present highly complex geological and petrophysical characteristics. These reservoirs, which consist of sandstone and shale bodies within a depth interval ranging from 500 to 2000 m, were characterized statistically by means of fractal modeling and geostatistical tools. For 14 wells within an area of study of approximately 6 km2, various geophysical well logs were initially edited and further analyzed to establish a correlation between logs and core data. The fractal modeling based on the R/S (rescaled range) methodology and the interpolation method by successive random additions were used to generate pseudo-well logs between observed wells. The application of geostatistical tools, sequential Gaussian simulation and exponential model variograms contributed to estimate the spatial distribution of petrophysical properties such as effective porosity (PHIE), permeability (K) and shale volume (VSH). From the analysis and correlation of the information generated in the present study, it can be said, from a general point of view, that the results not only are correlated with already reported information but also provide significant characterization elements that would be hardly obtained by means of conventional techniques.

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Methane emission to the atmosphere from landfills in the Canary Islands

10.5194/egusphere-egu2020-5651 ◽

2020 ◽

Author(s):

Eleazar Padrón ◽

María Asensio-Ramos ◽

Nemesio M. Pérez ◽

Daniel Di Nardo ◽

Violeta T. Albertos-Blanchard ◽

...

Keyword(s):

Canary Islands ◽

Interpolation Method ◽

Sampling Site ◽

Landfill Gas ◽

Mean Value ◽

Sequential Gaussian Simulation ◽

Fugitive Emission ◽

Contour Maps ◽

Direct Measurements ◽

Gaussian Simulation

Methane (CH4) is an important greenhouse gas, and is increasing in the atmosphere by 0.6% (10 ppb) each year. Important sources of this gas are landfills; in fact more than 10% of the total anthropogenic emissions of CH4 are originated in them by anaerobic degradation of organic matter. Even after years of being closed, a significant amount of landfill gas can be released to the atmosphere through its surface as diffuse or fugitive degassing.Many landfills currently report their CH4 emissions to the atmosphere using model-based methods, which are based on the rate of production of CH4, the oxidation rate of CH4 and the amount of CH4 recovered (Bingemer and Crutzen, 1987). This approach often involves large uncertainties due to inaccuracies of input data and many assumptions in the estimation. In fact, the estimated CH4 emissions from landfills in the Canary Islands published by the Spanish National Emission and Pollutant Sources Registration (PRTR-Spain) seem to be overestimated due to the use of protocols and analytical methodologies based on mathematical models. For this reason, direct measurements to estimate CH4 emissions in landfills are essential to reduce this uncertainty.In order to estimate the CH4 emissions to the atmosphere from landfills in the Canary Islands, 34 surveys have been performed since 1999 to the present. Each survey implies hundreds of CO2 and CH4 efflux measurements covering the landfill surface area. Surface landfill CO2 efflux measurements were carried out at each sampling site by means of a portable non-dispersive infrared spectrophotometer (NDIR) model LICOR Li800 following the accumulation chamber method. Samples of landfill gases were taken in the gas accumulated in the chamber and CO2 and CH4 were analyzed using a double channel VARIAN 4900 micro-GC. The CH4 efflux measurement was computed combining CO2 efflux and CH4/CO2 ratio. To quantify the diffuse or fugitive CO2 and CH4 emission, gas efflux contour maps were constructed using sequential Gaussian simulation (sGs) as interpolation method. Considering that (a) there are 6 controlled landfills in the Canary Islands, (b) the average area of the 34 studied cells is 0.15 km2 and (c) the mean value of the CH4 emission estimated for the studied cells range between 6.2 and 7.2 kt km-2 y-1, the estimated CH4 emission to the atmosphere from landfills in the Canary Islands showed a range of 5.7-6.7 kt y-1 (mean value of 6.2 kt y-1). On the contrary, and for the same period of time, the PRTR-Spain estimates the CH4 emission in the order of 6.4-16.4 kt y-1 (mean value of 9.2 kt y-1), nearly 46% more than our estimated value. This result demonstrates the need to perform direct measurements to estimate the surface fugitive emission of CH4 from landfills.Bingemer, H. G., and P. J. Crutzen (1987), J. Geophys. Res. 92, 2182-2187.

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Diffuse soil CO_2 degassing from Linosa island

Annals of Geophysics ◽

10.4401/ag-6476 ◽

2014 ◽

Vol 57 (3) ◽

Author(s):

Dario Cellura ◽

Vincenzo Stagno ◽

Marco Camarda ◽

Mariano Valenza

Keyword(s):

Sequential Gaussian Simulation ◽

Rift System ◽

Volcanic Complex ◽

Tectonic Structures ◽

Soil Degassing ◽

Active Tectonic ◽

Active Portion ◽

Sicily Channel ◽

Gaussian Simulation ◽

First Time

Herein, we present and discuss the result of 148 measurements of soil CO2 flux performed for the first time in Linosa island (Sicily Channel, Italy), a Plio-Pleistocene volcanic complex no longer active but still of interest owing to its location within a seismically active portion of the Sicily Channel rift system. The main purpose of this survey was to assess the occurrence of CO2 soil degassing, and compare flux estimations from this island with data of soil degassing from worldwide active volcanic as well as non-volcanic areas. To this aim soil CO2 fluxes were measured over a surface of about 4.2 km2 covering ~80% of the island. The soil CO2 degassing was observed to be mainly concentrated in the eastern part of the island likely due to volcano-tectonic lineaments, the presence of which is in good agreement with the known predominant regional faults system. Then, the collected data were interpreted using sequential Gaussian simulation that allowed estimating the total CO2 emissions of the island. Results show low levels of CO2 emissions from the soil of the island (~55 ton d-1) compared with CO2 emissions of currently active volcanic areas, such as Miyakejima (Japan) and Vulcano (Italy). Results from this study suggest that soil degassing in Linosa is mainly fed by superficial organic activity with a moderate contribution of a deep CO2 likely driven by NW-SE trending active tectonic structures in the eastern part of the island.

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Monitoring of diffuse CO2 degassing at NERZ, NWRZ and NSRZ volcanic systems of Tenerife, Canary Islands

Diffuse CO2 degassing monitoring of the Tenerife North–South Rift Zone (NSRZ) volcano, Canary Islands

Surface diffuse degassing monitoring of the Tenerife Northeastern Rift Zone (NERZ) volcano, Canary Islands

Diffuse He degassing monitoring of the Tenerife North-western Rift Zone (NWRZ) volcano, Canary Islands

Rn and CO<sub>2</sub> geochemistry of soil gas across the active fault zones in the capital area of China

Cretaceous lithostratigraphy of North-East Greenland

Central- and North-East Greenland Rifted Margin Composite Tectono-Sedimentary Element, From Onshore East Greenland to the Greenland Sea

Biomass and distribution of the red octopus (Octopus maya) in the north-east of the Campeche Bank

Distribution of petrophysical properties for sandy-clayey reservoirs by fractal interpolation

Methane emission to the atmosphere from landfills in the Canary Islands

Diffuse soil CO_2 degassing from Linosa island

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