InSAR constraints on the source parameters of the 2001 Bhuj earthquake

Schmidt, D. A.; Bürgmann, Roland

doi:10.1029/2005gl025109

Cited by 40 publications

(35 citation statements)

References 10 publications

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“…The comparison of the observed interferometric picture and modeled scheme of earthquake deformations shows many similar details ( Figure 5). Similar images have been obtained for all the significant earthquakes of the last decade: Neftegorsk, 1995, Russia [18], Bhuj, 2001, India [19]; Bam, 2003, Iran [20]; Sumatra (2004), Indonesia [21] etc. All these cases demonstrate co-seismic and post-seismic deformations.…”

Section: Insarsupporting

confidence: 63%

Satellite Remote Sensing in Seismology. A Review

Тронин

2009

Remote Sensing

110

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A wide range of satellite methods is applied now in seismology. The first applications of satellite data for earthquake exploration were initiated in the '70s, when active faults were mapped on satellite images. It was a pure and simple extrapolation of airphoto geological interpretation methods into space. The modern embodiment of this method is alignment analysis. Time series of alignments on the Earth's surface are investigated before and after the earthquake. A further application of satellite data in seismology is related with geophysical methods. Electromagnetic methods have about the same long history of application for seismology. Stable statistical estimations of ionosphere-lithosphere relation were obtained based on satellite ionozonds. The most successful current project "DEMETER" shows impressive results. Satellite thermal infra-red data were applied for earthquake research in the next step. Numerous results have confirmed previous observations of thermal anomalies on the Earth's surface prior to earthquakes. A modern trend is the application of the outgoing long-wave radiation for earthquake research. In '80s a new technology-satellite radar interferometry-opened a new page. Spectacular pictures of co-seismic deformations were presented. Current researches are moving in the direction of pre-earthquake deformation detection. GPS technology is also widely used in seismology both for ionosphere sounding and for ground movement detection. Satellite gravimetry has demonstrated its first very impressive results on the example of the catastrophic Indonesian earthquake in 2004. Relatively new applications of remote sensing for seismology as atmospheric sounding, gas observations, and cloud analysis are considered as possible candidates for applications.

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Section: Insarsupporting

confidence: 63%

Satellite Remote Sensing in Seismology. A Review

Тронин

2009

Remote Sensing

110

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“…Table 3. Black triangles (on the hanging wall), locations of the fault responsible for the 2001 Bhuj M w 7.6 earthquake (Schmidt and Bürgmann, 2006) and the Allah Bund fault (Malik et al, 2001); dashed line, location of the inferred Island Belt fault (Malik et al, 2001); filled circles, felt-intensity locations within 300 km of the epicenter; arrows, the change in epicentral location due to changes outlined in Table 3. Contours represent magnitudes from the epicentral location algorithm (Data and Methods) using the raw intensity data; they indicate a minimum magnitude location in the Gulf of Kachchh.…”

Section: Case Studiesmentioning

confidence: 99%

Intensity, Magnitude, Location, and Attenuation in India for Felt Earthquakes since 1762

Szeliga¹,

Hough²,

Martin³

et al. 2010

Bulletin of the Seismological Society of America

180

132

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A comprehensive, consistently interpreted new catalog of felt intensities for India (Martin and Szeliga, 2010, this issue) includes intensities for 570 earthquakes; instrumental magnitudes and locations are available for 100 of these events. We use the intensity values for 29 of the instrumentally recorded events to develop new intensity versus attenuation relations for the Indian subcontinent and the Himalayan region. We then use these relations to determine the locations and magnitudes of 234 historical events, using the method of Bakun and Wentworth (1997). For the remaining 336 events, intensity distributions are too sparse to determine magnitude or location. We evaluate magnitude and location accuracy of newly located events by comparing the instrumental-with the intensity-derived location for 29 calibration events, for which more than 15 intensity observations are available. With few exceptions, most intensity-derived locations lie within a fault length of the instrumentally determined location. For events in which the azimuthal distribution of intensities is limited, we conclude that the formal error bounds from the regression of Bakun and Wentworth (1997) do not reflect the true uncertainties. We also find that the regression underestimates the uncertainties of the location and magnitude of the 1819 Allah Bund earthquake, for which a location has been inferred from mapped surface deformation. Comparing our inferred attenuation relations to those developed for other regions, we find that attenuation for Himalayan events is comparable to intensity attenuation in California (Bakun and Wentworth, 1997), while intensity attenuation for cratonic events is higher than intensity attenuation reported for central/eastern North America (Bakun et al., 2003). Further, we present evidence that intensities of intraplate earthquakes have a nonlinear dependence on magnitude such that attenuation relations based largely on small-to-moderate earthquakes may significantly overestimate the magnitudes of historical earthquakes.

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“…For the estimation of ΔCFS, we used the distributed slip model as obtained from the inversion of InSAR data where the majority of slip confines within a 20 × 20 km region centred at a depth of 20 km (Schmidt & Burggmann 2006). The considered blind thrust fault plane whose down‐dip width and along strike length are 20 km and 20 km, respectively, is discretized into square subfaults with a dimension of 1 km resulting in an average slip of 14.8 m (Schmidt & Burggmann 2006). It will be important to note that the GF began to experience M w ≥ 4 events since 2003 August 5, and until 2006 March 6, another four earthquakes of M w = 4–4.7 have occurred along GF.…”

Section: Source Process and Static Stress Changesmentioning

confidence: 99%

Coulomb static stress variations in the Kachchh, Gujarat, India: Implications for the occurrences of two recent earthquakes in the 2001 Bhuj earthquake region

Mandal¹,

Chadha²,

Raju³

et al. 2007

Geophysical Journal International

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S U M M A R YDouble difference algorithm was used to relocate aftershock sequences of two M w = 5.6 Kachchh earthquakes (India), which have occurred on 2006 March 7 and April 6, along almost vertical strike-slip Gedi fault (GF) and south dipping reverse North Wagad fault (NWF), respectively. The relocated focal depths delineate a marked variation of 4 and 7 km in the brittle-ductile transition depths beneath GF and NWF, respectively. We modelled the Coulomb failure stress change ( CFS) produced by the 2001 mainshock and 2006 GEDI events on an optimally oriented plane. A strong correlation with occurrences of aftershocks and regions of increased CFS is obtained on both the faults. The predicted CFS on the GF increased by 0.14 MPa at 3 km depth, where the 2006 March 7 M w = 5.6 event occurred. The variation in brittle-ductile transition depths may be related to the perturbation in geothermal gradient resulted from the presence of intrusives or varying saturation state of fluid-filled fractured rock matrix beneath both the fault zones.

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InSAR constraints on the source parameters of the 2001 Bhuj earthquake

Cited by 40 publications

References 10 publications

Satellite Remote Sensing in Seismology. A Review

Satellite Remote Sensing in Seismology. A Review

Intensity, Magnitude, Location, and Attenuation in India for Felt Earthquakes since 1762

Coulomb static stress variations in the Kachchh, Gujarat, India: Implications for the occurrences of two recent earthquakes in the 2001 Bhuj earthquake region

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