Spatial variations in tectonic activity along the Kachchh Mainland Fault, Kachchh, western India: implications in seismic hazard assessment

2016 ◽  
Vol 82 (2) ◽  
pp. 947-961 ◽  
Author(s):  
S. P. Prizomwala ◽  
Tarun Solanki ◽  
Gaurav Chauhan ◽  
Archana Das ◽  
Nilesh Bhatt ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Spatial Variations ◽  
Tectonic Activity ◽  
Western India

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.

Rapid seismic hazard assessment of the Sabarmati River basin in Gujarat State, Western India using GIS techniques

2018 ◽  
Vol 78 (6) ◽  
pp. 3927-3942 ◽  
Author(s):  
Nisarg Bhatt ◽  
Vasu Pancholi ◽  
Sumer Chopra ◽  
Madan Mohan Rout ◽  
R. D. Shah ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
River Basin ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
Western India ◽  
Gujarat State ◽  
Gis Techniques ◽  
Sabarmati River

Multi criteria study for seismic hazard assessment of UNESCO world heritage Ahmedabad City, Gujarat, Western India

2019 ◽  
Vol 79 (4) ◽  
pp. 1721-1733
Author(s):  
Vinay Kumar Dwivedi ◽  
R. K. Dubey ◽  
Vasu Pancholi ◽  
Madan Mohan Rout ◽  
Pawan Singh ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Seismic Hazard Assessment ◽  
World Heritage ◽  
Western India ◽  
Unesco World Heritage

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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