Characterizing Surface Geology, Liquefaction Potential, and Maximum Intensity in the Kachchh Seismic Zone, Western India, through Microtremor Analysis

2017 ◽  
Vol 107 (3) ◽  
pp. 1277-1292 ◽  
Author(s):  
A. P. Singh ◽  
Arjav Shukla ◽  
M. Ravi Kumar ◽  
M. G. Thakkar
Keyword(s):  
Maximum Intensity ◽  
Western India ◽  
Seismic Zone ◽  
Liquefaction Potential ◽  
Surface Geology

Liquefaction potential mapping in Dholera region of western India

2018 ◽  
Vol 92 (1) ◽  
pp. 479-495
Author(s):  
Sarda Thokchom ◽  
Vasu Pancholi ◽  
B. K. Rastogi ◽  
N. N. Dogra
Keyword(s):  
Western India ◽  
Liquefaction Potential ◽  
Potential Mapping

Lithospheric resistivity structure of the 2001 Bhuj earthquake aftershock zone

2020 ◽  
Vol 224 (3) ◽  
pp. 1980-2000
Author(s):  
K K Abdul Azeez ◽  
Kapil Mohan ◽  
K Veeraswamy ◽  
B K Rastogi ◽  
Arvind K Gupta ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Critical Stress ◽  
Stress Conditions ◽  
Western India ◽  
Seismic Zone ◽  
Bhuj Earthquake ◽  
Resistivity Structure ◽  
Aftershock Activity ◽  
Stress Regime ◽  
Upward Migration

SUMMARY The Bhuj area, in the Kutch region of western India, is a unique intraplate seismic zone in the world where aftershock activity associated with a large magnitude earthquake (7.7 Mw Bhuj earthquake on 26 January 2001) has persisted over a decade and up till today. We studied the lithospheric resistivity structure of the Bhuj earthquake aftershock zone to gain more insight into the structure and processes influencing the generation of intraplate seismicity in broad and, in particular, to detect the deep origin and upward migration channels of fluids linked to the crustal seismicity in the area. A lithospheric resistivity model deduced from 2-D and 3-D inversions of long-period magnetotelluric (MT) data shows low resistive lithospheric mantle, which can be best explained by a combination of a small amount of interconnected melts and aqueous fluid in the upper mantle. The MT model also shows a subvertical modestly conductive channel, spatially coinciding with the Kutch Mainland Fault, which we interpret to transport fluids from the deep lithosphere to shallow crust. We infer that pore pressure buildup aids to achieve the critical stress conditions for rock failure in the weak zones, which are pre-stressed by the compressive stress regime generated by ongoing India–Eurasia collision. The fluidized zone in the upper mantle beneath the area perhaps provides continuous fluid supply, which is required to maintain the critical stress conditions within the seismogenic crust for continued seismicity.

Analysis of Shallow Microearthquakes in the South Sebec Seismic Zone, Maine, 1989–1990

1992 ◽  
Vol 63 (4) ◽  
pp. 557-566 ◽  
Author(s):  
William E. Doll ◽  
Carol D. Rea ◽  
John E. Ebel ◽  
Sandra J. Craven ◽  
John J. Cipar
Keyword(s):  
New England ◽  
Satellite Images ◽  
Fault Plane ◽  
Seismic Zone ◽  
Fault Plane Solutions ◽  
Motion Data ◽  
First Motion ◽  
High Level ◽  
Surface Geology

Abstract Fifteen years of regional monitoring by the New England Seismic Network indicated a locally high level of seismicity near South Sebec, between the towns of Milo and Dover-Foxcroft in central Maine. Most of the events were located in a diffuse zone south of the distinctive, ENE trending Harriman Pond Fault (HPF) which is indicated by brittle deformation in outcrop and is represented as a depression in topographic maps and satellite images. A portable network consisting of both digital and analog instruments was deployed during the summers of 1989 and 1990 in order to characterize the pattern of the microearthquakes and to determine high-resolution epicenters, depths, and fault plane solutions. Seventy-three events were detected during the experiment, of which 28 could be located. Many of the events south of the fault lie along a NNW trending line which has no major expression in the surface geology. Only, a few of the events are subparallel to the HPF. The first motion data were insufficient for the determination of any fault plane solutions.

Granitic basement below Deccan Traps Unearthed by drilling in the Koyna seismic zone, Western India

2013 ◽  
Vol 81 (2) ◽  
pp. 289-290 ◽  
Author(s):  
Sukanta Roy ◽  
N. P. Rao ◽  
Vyasulu V. Akkiraju ◽  
Deepjyoti Goswami ◽  
Mrinal Sen ◽  
...  
Keyword(s):  
Deccan Traps ◽  
Western India ◽  
Seismic Zone

A magnetotelluric (MT) study across the Koyna seismic zone, western India: evidence for block structure

2004 ◽  
Vol 142 (1-2) ◽  
pp. 23-36 ◽  
Author(s):  
S.V.S. Sarma ◽  
B. Prasanta ◽  
K. Patro ◽  
T. Harinarayana ◽  
K. Veeraswamy ◽  
...  
Keyword(s):  
Block Structure ◽  
Western India ◽  
Seismic Zone

scholarly journals Liquefaction potential assessment of saturated loess

2021 ◽  
Vol 50 (1) ◽  
pp. 37-44
Author(s):  
Doncho Karastanev ◽  
Boriana Tchakalova
Keyword(s):  
Free Field ◽  
Danube River ◽  
Substantial Part ◽  
Eurocode 8 ◽  
Seismic Zone ◽  
Liquefaction Potential ◽  
Fine Grain ◽  
Field Evidence ◽  
Simplified Procedure ◽  
Ground Profile

Usually, soils with mainly fine grain-sized content, as loess, are considered to have low liquefaction potential. Regardless of this, many researchers have analyzed and presented much field evidence that silty soil (in particular loess) liquefaction occurred under certain conditions. In Bulgaria, the first loess river terrace (T1) within the Danube River lowland areas is covered by low plasticity silty loess with a thickness of 10–12 m. Тhe groundwater level is often located between 5 m and 8 m in depth so that substantial part of loess deposits are saturated and immersed. Meanwhile, that region of North Bulgaria is under the influence of the Vrancea seismic zone in Romania, which is able to generate strong earthquakes with magnitudes M≥7.0. The present paper aims to assess the liquefaction potential of loess in a ground profile representative of the T1 loess river terraces by the so-called simplified procedure based on SPT, which is incorporated in the software code NovoLiq. The safety factor against liquefaction FSL is estimated at the respective depths in one-dimensional model of the ground profile for free-field conditions at varying peak ground accelerations amax. The critical amax, at which liquefaction of loess is possible according to the assumptions of the applied simplified procedure and the requirements of the National Annex of Bulgaria to Eurocode 8, has been established.

Erratum to “A magnetotelluric (MT) study across the Koyna seismic zone, western India: evidene for block structure” [Phys. Earth Planet Inter. 142 (2004) 23–36]

2004 ◽  
Vol 147 (4) ◽  
pp. 365
Author(s):  
S.V.S. Sarma ◽  
B. Prasanta K. Patro ◽  
T. Harinarayana ◽  
K. Veeraswamy ◽  
R.S. Sastry ◽  
...  
Keyword(s):  
Block Structure ◽  
Western India ◽  
Seismic Zone ◽  
Earth Planet

Remote Triggering in the Koyna-Warna Reservoir-Induced Seismic Zone, Western India

2018 ◽  
Vol 123 (3) ◽  
pp. 2318-2331 ◽  
Author(s):  
Abhey Ram Bansal ◽  
N. Purnachandra Rao ◽  
Zhigang Peng ◽  
D. Shashidhar ◽  
Xiaofeng Meng
Keyword(s):  
Western India ◽  
Seismic Zone ◽  
Remote Triggering

Earthquakes in Lassen Volcanic National Park, California

1979 ◽  
Vol 69 (3) ◽  
pp. 867-875
Author(s):  
Fred W. Klein
Keyword(s):  
National Park ◽  
Radial Symmetry ◽  
Seismic Zone ◽  
Focal Mechanism Solutions ◽  
The North ◽  
Lassen Peak ◽  
Lassen Volcanic National Park ◽  
Surface Geology ◽  
Seismograph Network ◽  
Chaos Crags

abstract A small seismograph network of six stations now monitors earthquakes in and near Lassen Volcanic National Park. The first 14 months of recording has revealed a northwest-trending seismic zone passing through the park. This zone is the resolved equivalent of a diffuse zone of historical epicenters passing through Lassen Park and Truckee, California, and is parallel to nearby lineaments in California, Oregon, and Nevada recognized from surface geology. Three dense concentrations of earthquakes correlate very closely with three geothermal areas. One concentration also outlines the north and east sides of the 4-km-diameter Mt. Tehama caldera. The recent dacite plug domes of Lassen Peak and Chaos Crags are nearly aseismic, however. Several approximate focal mechanism solutions indicate primarily normal faulting with east-west extension. This implies the northwest-trending seismic zone is undergoing extension and right-lateral shear. Extension directions near the center of the network display a radial symmetry that could be caused by a broad updoming or magma injection centered near Lassen Peak or Chaos Crags.

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