scholarly journals Application of observations of recent tectonic activity in the Świebodzice Depression (the Sudetes, SW Poland) in assessing seismic hazard in the Fore-Sudetic Monocline

2018 ◽  
Vol 55 ◽  
pp. 00001
Author(s):  
Marek Kaczorowski ◽  
Damian Kasza ◽  
Ryszard Zdunek ◽  
Roman Wronowski
Keyword(s):  
Seismic Hazard ◽  
Tectonic Activity ◽  
Sw Poland

scholarly journals A Structural-Thermal Model of the Karkonosze Pluton (Sudetes Mountains, SW Poland) for Hot Dry Rock (HDR) Geothermal Use

2016 ◽  
Vol 61 (4) ◽  
pp. 917-935 ◽  
Author(s):  
Wiesław Bujakowski ◽  
Antoni Barbacki ◽  
Maciej Miecznik ◽  
Leszek Pająk ◽  
Robert Skrzypczak
Keyword(s):  
Central Area ◽  
Tectonic Activity ◽  
Fluid Migration ◽  
Geothermal Resources ◽  
Radiogenic Heat ◽  
Cycle System ◽  
The Earth ◽  
Binary Cycle ◽  
Sw Poland ◽  
Insight Into

Abstract The main objective of this study was to develop a spatial temperature distribution of the Karkonosze Pluton to indicate optimum locations for HDR systems at drillable depth. HDR geothermal technology makes it possible to extract heat from the Earth in areas where no hydro-geothermal resources are present. To produce electricity in a binary cycle, system temperatures of > 100°C are usually required. In this paper, the authors have analysed the potential opportunities for applying HDR technology in the area of the Karkonosze Pluton, which is regarded as an optimum location for the application of the HDR concept (due to the potential for stimulation offered by the mechanical properties of the granites, radiogenic heat production, modern tectonic activity, and the thickness of the pluton). The model used in the analysis, which takes into account a hypothetical assessment of the manner and paths of fluid migration within the pluton, provides an insight into the spatial distribution of subsurface temperatures. It thus allows the location of relatively shallow high-temperature zones, which are optimal for the efficient application of HDR technology, to be identified. With respect to this technology, the Szklarska Poręba area and the NE part of the pluton seem to be better targets than the Cieplice central area, where the model indicated much lower temperatures (e.g. at a depth of 5,000 m, estimated temperatures in the vicinity of Szklarska Poręba were about 185°C and in the vicinity of Cieplice they were about 140°C).

scholarly journals Note on seismic hazard assessment using gradient of uplift velocities in the Turan block (Central Asia)

2005 ◽  
Vol 5 (1) ◽  
pp. 43-47 ◽  
Author(s):  
M. Jaboyedoff ◽  
M.-H. Derron ◽  
G. M. Manby
Keyword(s):  
Seismic Hazard ◽  
Central Asia ◽  
Hazard Assessment ◽  
Seismic Activity ◽  
Seismic Hazard Assessment ◽  
Tectonic Activity ◽  
Upper Crust ◽  
Rheologic Property ◽  
Hazard Zone ◽  
Highly Strained

Abstract. Uplift gradients can provide the location of highly strained zones, which can be considered to be seismic. The Turan block (Central Asia) contains zones with high gradient of uplift velocities, above the threshold 0.04mm km-1year-1. Some of these zones are associated with important seismic activity and others are not correlated with any recent important recorded earthquakes, however, recent faults scarps as well as diverted rivers may indicate a recent tectonic activity. This threshold of gradient is probably a significant rheologic property of the upper crust. On the basis of these considerations the Uzboy river area is proposed as a potential high seismic hazard zone.

Updated seismotectonic zoning scheme of Metropolitan France, with reference to geologic and seismotectonic data

2013 ◽  
Vol 184 (3) ◽  
pp. 225-259 ◽  
Author(s):  
Stéphane Baize ◽  
Edward Marc Cushing ◽  
Francis Lemeille ◽  
Hervé Jomard
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Active Faults ◽  
Seismic Hazard Assessment ◽  
Tectonic Activity ◽  
Hazard Evaluation ◽  
Boundary Location ◽  
Seismotectonic Zones ◽  
Seismic Hazard Evaluation ◽  
Surface Geology

Abstract This work presents the seismotectonic zoning scheme of Metropolitan France developed by the IRSN (French Institute for Radioprotection and Nuclear Safety) within the framework of its seismic hazard assessment activities. It is the outcome of many years of work following the publication of the “seismotectonic atlas” in 1993 [Grellet et al., 1993]. This scheme supports the assessment of seismic hazard by IRSN. It takes into account the most recent data concerning the deep and surface geology, as well as those related to seismotectonics and tectonic activity. It finally includes 67 surface seismotectonic zones (STZ), as well as a catalogue of 74 faults or structures (named hereafter “potential active faults”) for which indications of Neogene to Quaternary displacement can be inferred. The description of the zoning scheme comes along with an estimation of the uncertainty on the boundary location between adjacent STZ. We also qualitatively determine a “relevance order” for each limit, so as to illustrate their reliability to separate regions of different seismogenic potential. Also, we attributed to the faults an indication whose purpose is to reflect the recent character of their activity, and thus their seismotectonic potential. This assessment of uncertainties was undertaken to better integrate the zoning scheme in the general approach, which arises from recent studies, namely the propagation of the uncertainties in seismic hazard evaluation, whether deterministic or probabilistic.

scholarly journals Application of observations of recent tectonic activity in the Świebodzice Depression (the Sudetes, SW Poland) in assessing seismic hazard in the Fore-Sudetic Monocline

2018 ◽  
Vol 55 ◽  
pp. 00001 ◽  
Author(s):  
Marek Kaczorowski ◽  
Damian Kasza ◽  
Ryszard Zdunek ◽  
Roman Wronowski
Keyword(s):  
Vertical Movement ◽  
Rock Massif ◽  
Fault System ◽  
Tectonic Activity ◽  
Regional Tectonic ◽  
Sw Poland ◽  
Tidal Signal ◽  
Representative Function ◽  
Low Activity

Tiltmeter observations with application of horizontal pendulums have been carried out for 40 years in the Geodynamic Laboratory in Książ. Long-term observations have not indicated any correlation of these data with meteorological or seasonal phenomena. Following an epoch of fast azimuth changes, a gradual compensation process took place, excluding the effect of gravitational creep of the rock massif. An assumption was made that the observed large changes of the equilibrium azimuths of the horizontal pendulums that result from tectonic tilt of the foundation blocks. Multiannual tiltmeter observations allowed to determine the temporal characteristics and amplitude tectonic effects. Intervals of strong tectonic activity in the rock massif of the Świebodzice Depression last from several days to over ten weeks and are separated by several tens of hours of low activity. Amplitude of the rock massif deformation reaches values from over ten to several tens of amplitudes of the tidal signal, i.e. up to several hundreds of micrometres. Water-tube tiltmeters (WT) launched in 2003 have confirmed the characteristics of tectonic effects and their incidental occurrence. Beside the tilt effects, WT have enabled to confirm vertical movement of the foundation blocks. Geological investigations in the Świebodzice Depression have indicated the presence of a numerous faults separating particular blocks in the rock massif. The presence of this fault system favours the dislocation of foundation blocks, which results in a quake-less relaxation of tectonic stresses and absence lack of seismic activity in the Świebodzice Depression. Foundation blocks separated by faults combined with the multiscale measurement system of WTs form a natural detector of regional tectonic activity, allowing to determine with micrometric resolution the representative function of tectonic activity in the rock massif of the Świebodzice Depression.

Seismic regionalization in North America based on Average Regional Seismic Hazard Index

1974 ◽  
Vol 64 (5) ◽  
pp. 1509-1528 ◽  
Author(s):  
B. F. Howell
Keyword(s):  
North America ◽  
Seismic Hazard ◽  
Great Basin ◽  
Hazard Index ◽  
Average Energy ◽  
Seismic Energy ◽  
High Heat ◽  
Tectonic Activity ◽  
Convection Cell ◽  
Logarithmic Scale

Abstract Cumulative Seismic Hazard Index (CSHI) is the logarithm of the sum of the seismic energies experienced at any location. Average Regional Seismic Hazard Index (ARSHI) is the regional average of Cumulative Hazard Index values normalized to 100 years. Both can be expressed in the same units as Mercalli intensity. ARSHI differs from previously proposed measures of seismicity in that it compensates for variations in the completeness of the historic record and for variations in the rate of attenuation of seismic energy with distance. More rapid attenutation of intensity with distance in the West than in the East reduces the difference in hazard between these regions. In North America between 30° and 50° N latitude, ARSHI varies from 8.44 in the Western Nevada to 5.28 in the Canadian Shield and Plains provinces. Since ARSHI is measured on a logarithmic scale, this is a range of a factor of over 1,000 in average energy flux. A trough of low seismicity between areas of high seismicity roughly coincides with areas of recent volcanic activity and high heat flow in parts of the Great Basin, the Columbia Plateau and adjoining areas. This low seismicity is interpreted as possibly being due to weakening of the crustal rocks by higher than normal temperatures. This interpretation would mean that low seismicity in this area is not evidence of a lack of tectonic activity. It is consistent with either a rising convection cell, a branch of the East Pacific Rise system underlying this area, or with igneous upwelling over an old subduction zone.

scholarly journals Radon and tectonic activity of the faults at the Central Mongolia

2019 ◽  
Vol 487 (5) ◽  
pp. 538-542
Author(s):  
K. Z. Seminsky ◽  
A. A. Bobrov ◽  
S. Demberel
Keyword(s):  
Seismic Hazard ◽  
Seismic Activity ◽  
Active Regions ◽  
Tectonic Activity ◽  
Fault Activity ◽  
Stages Of Development ◽  
Central Mongolia ◽  
Dynamic Framework ◽  
The Relationship ◽  
Late Stages

The relationship between the radon and tectonic activity of the faults for two geodynamically active regions of Central Mongolia is shown. Radon fault activity grew with increased seismic activity and with an increase in the contribution of extension in the dynamic framework of their formation. It is higher in concentrated faults of late stages of development compared with wide zones of fractures in the early stages of the formation. The established patterns will help increase the effectiveness of the use of radon surveys in studies of the seismic hazard of faults of the Earth’s crust.

scholarly journals PROBLEMS OF SEISMIC HAZARD IN CONNECTION WITH TELLURIC AND COSMIC PROCESSES

2016 ◽  
Author(s):  
А.Д. Жигалин ◽  
О.Г. Попова
Keyword(s):  
Seismic Hazard ◽  
Seismic Activity ◽  
Seismic Risk ◽  
Seismic Monitoring ◽  
Tectonic Activity ◽  
Geological Environment ◽  
Passive Seismic

На примере изучения временных вариаций геодинамических свойств геологической среды в районах с различной сейсмической активностью показана эффективность пассивного сейсмического мониторинга при оценке уровня сейсмической опасности и сейсмического риска. Показано влияние теллурических (земных) и космических факторов на режим сейсмичности в районах с разной тектонической активностью. On an example of the geological environment geodynamic properties temporary variations studying in areas with various seismic activity efficiency of passive seismic monitoring is shown at an assessment of a level of seismic danger and seismic risk. Influence of telluric (Earth) and space factors on a mode of seismicity in areas with different tectonic activity is shown.

scholarly journals Seismotectonic model and probabilistic seismic hazard assessment for Papua New Guinea

2020 ◽  
Vol 18 (15) ◽  
pp. 6571-6605 ◽  
Author(s):  
Hadi Ghasemi ◽  
Phil Cummins ◽  
Graeme Weatherill ◽  
Chris McKee ◽  
Martyn Hazelwood ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Papua New Guinea ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Seismic Source ◽  
New Guinea ◽  
Building Code ◽  
Tectonic Activity ◽  
Probabilistic Seismic Hazard Assessment ◽  
Probabilistic Seismic Hazard

Abstract Papua New Guinea (PNG) lies in a belt of intense tectonic activity that experiences high levels of seismicity. Although this seismicity poses significant risks to society, the Building Code of PNG and its underpinning seismic loading requirements have not been revised since 1982. This study aims to partially address this gap by updating the seismic zoning map on which the earthquake loading component of the building code is based. We performed a new probabilistic seismic hazard assessment for PNG using the OpenQuake software developed by the Global Earthquake Model Foundation (Pagani et al. in Seism Res Lett 85(3):692–702, 2014). Among other enhancements, for the first time together with background sources, individual fault sources are implemented to represent active major and microplate boundaries in the region to better constrain the earthquake-rate and seismic-source models. The seismic-source model also models intraslab, Wadati–Benioff zone seismicity in a more realistic way using a continuous slab volume to constrain the finite ruptures of such events. The results suggest a high level of hazard in the coastal areas of the Huon Peninsula and the New Britain–Bougainville region, and a relatively low level of hazard in the southwestern part of mainland PNG. In comparison with the seismic zonation map in the current design standard, it can be noted that the spatial distribution of seismic hazard used for building design does not match the bedrock hazard distribution of this study. In particular, the high seismic hazard of the Huon Peninsula in the revised assessment is not captured in the current building code of PNG.

Regionally Optimized Background Earthquake Rates from ETAS (ROBERE) for Probabilistic Seismic Hazard Assessment

2020 ◽  
Vol 110 (3) ◽  
pp. 1172-1190 ◽  
Author(s):  
Andrea L. Llenos ◽  
Andrew J. Michael
Keyword(s):  
Seismic Hazard ◽  
San Francisco ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
B Value ◽  
Tectonic Activity ◽  
Probabilistic Seismic Hazard Assessment ◽  
Probabilistic Seismic Hazard ◽  
Background Rate ◽  
Aftershock Sequences

ABSTRACT We use an epidemic-type aftershock sequence (ETAS) based approach to develop a regionally optimized background earthquake rates from ETAS (ROBERE) method for probabilistic seismic hazard assessment. ROBERE fits parameters to the full seismicity catalog for a region with maximum-likelihood estimation, including uncertainty. It then averages the earthquake rates over a suite of catalogs from which foreshocks and aftershocks have been removed using stochastic declustering while maintaining the same Gaussian smoothing currently used for the U.S. Geological Survey National Seismic Hazard Model (NSHM). The NSHM currently determines these rates by smoothing a single catalog from which foreshocks and aftershocks have been removed using the method of Gardner and Knopoff (1974; hereafter, GK74). The parameters used in GK74 were determined from subjectively identified aftershock sequences, unlike ROBERE, in which both background rate and aftershock triggering parameters are objectively fitted. A major difference between the impacts of the two methods is GK74 significantly reduces the b-value, a critical value for seismic hazard analysis, whereas ROBERE maintains the original b-value from the full catalog. We apply these methods to the induced seismicity in Oklahoma and Kansas and tectonic activity in the San Francisco Bay Region. Using GK74 gives lower overall earthquake rates but estimates higher hazard due to the reduction in the b-value. ROBERE provides higher earthquake rates, at the magnitude of completeness, but lower hazard because it does not alter the b-value. We test two other declustering methods that produce results closer to ROBERE but do not use objectively fit parameters, include uncertainty, and may not work as well in other areas. We suggest adopting ROBERE for the NSHM so that our hazard estimates are based on an objective analysis, including uncertainty, and do not depend strongly on potentially biased b-values, which was never the goal of the existing methodology.

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