Hydrogeochemistry of an Acid River and Lake Related to an Active Volcano. The Case of Study: Agrio River—Copahue Volcano in Patagonia, Argentina

2021 ◽  
pp. 75-94
Author(s):  
Joaquín Llano ◽  
María Clara Lamberti ◽  
Daniel Sierra ◽  
Mariano Agusto
Keyword(s):  
Active Volcano

STUDY ON MONITORING EFFICIENCY OF ACTIVE VOLCANO BY DEEP LEARNING

2019 ◽  
Vol 75 (2) ◽  
pp. I_22-I_29
Author(s):  
Masashi YAMAWAKI ◽  
Kou UEYAMA ◽  
Naoto NAKAMURA ◽  
Kenji KIKAWA ◽  
Kouji ISHIDA ◽  
...  
Keyword(s):  
Deep Learning ◽  
Active Volcano

scholarly journals Hydrochemical Characterisation of High-Fluoride Groundwater and Development of a Conceptual Groundwater Flow Model Using a Combined Hydrogeological and Hydrochemical Approach on an Active Volcano: Mount Meru, Northern Tanzania

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2159
Author(s):  
George Bennett ◽  
Jill Van Reybrouck ◽  
Ceven Shemsanga ◽  
Mary Kisaka ◽  
Ines Tomašek ◽  
...  
Keyword(s):  
Drinking Water ◽  
Large Scale ◽  
Active Volcano ◽  
Aquifer System ◽  
Groundwater Samples ◽  
Northern Tanzania ◽  
Different Seasons ◽  
High Fluoride ◽  
Arusha National Park ◽  
The Impact

This study characterises high-fluoride groundwater in the aquifer system on the flanks of Mount Meru, focusing on parts of the flanks that were only partially or not at all covered by previous research. Additionally, we analyse the impact of rainwater recharge on groundwater chemistry by monitoring spring discharges during water sampling. The results show that the main groundwater type in the study area is NaHCO3 alkaline groundwater (average pH = 7.8). High F− values were recorded: in 175 groundwater samples, the concentrations range from 0.15 to 301 mg/L (mean: 21.89 mg/L, median: 9.67 mg/L), with 91% of the samples containing F− values above the WHO health-based guideline for drinking water (1.5 mg/L), whereas 39% of the samples have Na+ concentrations above the WHO taste-based guideline of 200 mg/L. The temporal variability in F− concentrations between different seasons is due to the impact of the local groundwater recharge. We recommend that a detailed ecohydrological study should be carried out for the low-fluoride springs from the high-altitude recharge areas on the eastern and northwestern flanks of Mount Meru inside Arusha National Park. These springs are extracted for drinking purposes. An ecohydrological study is required for the management of these springs and their potential enhanced exploitation to ensure the sustainability of this water extraction practice. Another strategy for obtaining safe drinking water could be to use a large-scale filtering system to remove F− from the groundwater.

scholarly journals Probabilistic Tsunami Hazard Analysis of Inundated Buildings Following a Subaqueous Volcanic Explosion Based on the 1716 Tsunami Scenario in Taal Lake, Philippines

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 92
Author(s):  
Kwanchai Pakoksung ◽  
Anawat Suppasri ◽  
Fumihiko Imamura
Keyword(s):  
Hazard Analysis ◽  
Active Volcano ◽  
The Philippines ◽  
Tsunami Hazard ◽  
Initial Water ◽  
Volcanic Explosion ◽  
Inundation Depth ◽  
Tsunami Mitigation ◽  
Probabilistic Tsunami Hazard Analysis ◽  
Tunami N2

A probabilistic hazard analysis of a tsunami generated by a subaqueous volcanic explosion was performed for Taal Lake in the Philippines. The Taal volcano at Taal Lake is an active volcano on Luzon Island in the Philippines, and its eruption would potentially generate tsunamis in the lake. This study aimed to analyze a probabilistic tsunami hazard of inundated buildings for tsunami mitigation in future scenarios. To determine the probabilistic tsunami hazard, different explosion diameters were used to generate tsunamis of different magnitudes in the TUNAMI-N2 model. The initial water level in the tsunami model was estimated based on the explosion energy. The tsunami-induced inundation from the TUNAMI-N2 model was overlaid on the distribution of buildings. The tsunami hazard analysis of inundated buildings was performed by using the maximum inundation depth in each explosion case. These products were used to calculate the probability of the inundated building given the occurrence of a subaqueous explosion. The results from this study can be used for future tsunami mitigation if a tsunami is generated by a subaqueous volcanic explosion.

Hydrologic and thermal modeling of an active volcano: the Piton de la Fournaise, Reunion

1997 ◽  
Vol 191 (1-4) ◽  
pp. 37-63 ◽  
Author(s):  
Sophie Violette ◽  
Emmanuel Ledoux ◽  
Patrick Goblet ◽  
Jean-Pierre Carbonnel
Keyword(s):  
Thermal Modeling ◽  
Active Volcano ◽  
Piton De La Fournaise

Resistivity monitoring of an active volcano using the controlled-source electromagnetic technique: Kilauea, Hawaii

1985 ◽  
Vol 90 (B14) ◽  
pp. 12545 ◽  
Author(s):  
Dallas B. Jackson ◽  
James Kauahikaua ◽  
Charles J. Zablocki
Keyword(s):  
Active Volcano ◽  
Controlled Source

scholarly journals Twin enigmatic microseismic sources in the Gulf of Guinea observed on intercontinental seismic stations

2013 ◽  
Vol 194 (1) ◽  
pp. 362-366 ◽  
Author(s):  
Yingjie Xia ◽  
Sidao Ni ◽  
Xiangfang Zeng
Keyword(s):  
North America ◽  
Temporal Variation ◽  
Crustal Structure ◽  
Source Region ◽  
Broad Band ◽  
Active Volcano ◽  
Gulf Of Guinea ◽  
Waveform Data ◽  
Seismic Stations ◽  
The Earth

Abstract Based on studies of continuous waveform data recorded on broad-band seismograph stations in Africa, Europe and North America, we report evidences for two temporally persistent and spatially localized monochromatic vibrating sources (around 0.036 and 0.038 Hz, respectively) in the Gulf of Guinea, instead of just one source (0.038 Hz or 26 s) found 50 yr ago. The location of the 0.036 Hz source is close to the Sao Tome Volcano, therefore it may be related to volcano processes. However, the 0.038 Hz source cannot be explained with known mechanisms, such as tectonic or oceanic processes. The most likely mechanism is volcano processes, but there is no reported active volcano in source region. Such repetitive vibration sources may provide valuable tools for detecting temporal variation of crustal structure of the Earth.

scholarly journals Imaging an Active Volcano Edifice at Tenerife Island, Spain

Eos ◽  
2008 ◽  
Vol 89 (32) ◽  
pp. 289 ◽  
Author(s):  
Jesús M. Ibáñez ◽  
Andreas Rietbock ◽  
Araceli García-Yeguas
Keyword(s):  
Active Volcano ◽  
Tenerife Island

La flore et la végétation de la partie méridionale de l'Archipel des Nouvelles Hébrides

1975 ◽  
Vol 272 (918) ◽  
pp. 329-342 ◽  
Keyword(s):  
Human Population ◽  
New Caledonia ◽  
Cloud Forest ◽  
Active Volcano ◽  
Southern Region ◽  
Vegetation Types ◽  
Mountainous Regions ◽  
Secondary Vegetation ◽  
New Hebrides ◽  
Infertile Soils

The Southern region of the New Hebrides consists of five islands of very different size, clearly separated from and with a cooler climate than the remainder of the archipelago. Only the three largest islands have been studied botanically. These islands are Aneityum and Erromanga, now sparsely populated, where there is still extensive climax vegetation on the deep, infertile soils, and Tanna, with a dense human population, where, except in mountainous regions, there is scarcely anything but secondary vegetation, on generally fertile soils that are periodically rejuvenated by ash showers from a continuously active volcano. The principal vegetation types recognized are: dense Agathis (kauri) - Calophyllum forest; cloud forest, with mosses and ferns, on ridges above 500 m altitude; low forests or thickets with Euphorbiaceae, Hibiscus or Leucaena ; open Acacia spirorbis forest; thickets of Myrtaceae and Vaccinium ; various associations more or less dominated by grasses. The flora, though relatively rich in the New Hebridean context, appears poor in comparison with that of Fiji, to which it is nevertheless fairly closely related, and even poorer in comparison with that of New Caledonia. Its wider affinities are Malaysian.

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