Great earthquakes, seismicity gaps and potential for earthquake disaster along the Himalaya plate boundary

Khattri, K. N.

doi:10.1016/0040-1951(87)90067-9

Cited by 294 publications

(116 citation statements)

References 33 publications

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“…Khattri (1987) assesses the magnitude of the 1866 event as M 7.6, based on rupture lengthmagnitude scaling relationships (Wyss, 1979). Although our epicentral location is poorly constrained due to a lack of observations north of Kathmandu, our data are consistent with an epicentral location within 80 km of Kathmandu and a magnitude of 7:2 0:2 (Fig.…”

Section: The 1833 and 1866 Nepal Earthquakessupporting

confidence: 55%

See 1 more Smart Citation

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

179

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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Section: The 1833 and 1866 Nepal Earthquakessupporting

confidence: 55%

“…A moderate earthquake occurred on 23 May 1866 near Kathmandu that is mentioned by several authors (Oldham, 1883;Khattri and Tyagi, 1983;Khattri, 1987;Rajendran and Rajendran, 2005). Khattri (1987) assesses the magnitude of the 1866 event as M 7.6, based on rupture lengthmagnitude scaling relationships (Wyss, 1979).…”

Section: The 1833 and 1866 Nepal Earthquakesmentioning

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

179

132

View full text Add to dashboard Cite

show abstract

“…These methods generate the geoelectric strike directions with 90 ambiguity. This ambiguity has been removed by constraining the strike direction to be consistent with the main Himalayan arc (northwest-southeast) in the region 27 . Phase tensor-based method is considered to be more accurate for determination of geoelectric strike direction due to the fact that phase is not affected by small-scale electric distortions 22 .…”

Section: Casementioning

confidence: 99%

Transverse Tectonics Feature Delineated by Modelling of Magnetotelluric Data from Garhwal Himalaya Corridor, India

et al. 2016

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We analyse magnetotelluric data recorded in the Garhwal Himalaya corridor, India, to study dimensionality and strike direction of the geoelectric structure. The geoelectric structure dimensionality in the corridor shows spatial variation with period. Geoelectric strike directions of the main Himalayan thrusts associated with the main arc -Main Frontal Thrust, Main Boundary Thrust and Main Central Thrust -are N72W  8, N70W  3 and N71W  6 respectively. Cross-strike directions oriented transverse and oblique with respect to the main arc geometry are also delineated. Transverse feature is constrained using 3D modelling.

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“…[4] The importance of this kind of study lies in the fact that the Himalayan region is characterized by a significant historical seismicity, which includes the greatest earthquakes of the 20th century that heavily affected the sub-Himalayan belt [Seeber and Armbruster, 1981;Khattri, 1987;Ambraseys and Bilham, 2000;Bilham et al, 2001]. The late Quaternary tectonic unrest and the consequent evolving topography within the sub-Himalayan mountain belt provide an opportunity to investigate relief development versus seismicity, especially by using different geospatial data sets as well as geological and seismological information.…”

Section: Introductionmentioning

confidence: 99%

The sub‐Himalayan fold‐thrust belt in the 1905 Kangra earthquake zone: A critical taper model perspective for seismic hazard analysis

2012

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[1] We investigate the broader epicentral area of the M = 7.8, 1905 Kangra earthquake(s), north India, affecting the sub-Himalayan hills. The tectonics of the area is characterized by two major rentrants (Kangra and Dehradun) interposed by the Nahan Salient. The first-order topography between the Himalayan Frontal Thrust and the Main Boundary Thrust shows a marked lateral variation along strike of the mean gradient, characterized by a very small mean slope angle ($1 ) in correspondence with the reentrants and higher values ($3 ) in the salient. These tectonic and topographic features also show a good correspondence with the peculiar macroseismic field of the 1905 event(s), which is characterized by two distinct intensity maxima, separated by a distance of $150 km, clearly overlapping the two major tectonic reentrants. In this paper, based on available geological and geophysical information and a critical analysis of the general mechanical constraints, the seismogenic volume of the external sector of the chain is investigated in terms of critical taper model attempting to clarify the possible correlations between tectonics, topography and seismicity in the sub-Himalayan belt. Based on different assumptions, three possible seismotectonic scenarios are explored in order to constrain their likelihood and therefore to suggest a potential seismic gap in the area corresponding to the Nahan Salient, which may experience an event of significant magnitude in the future.

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Great earthquakes, seismicity gaps and potential for earthquake disaster along the Himalaya plate boundary

Cited by 294 publications

References 33 publications

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

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

Transverse Tectonics Feature Delineated by Modelling of Magnetotelluric Data from Garhwal Himalaya Corridor, India

The sub‐Himalayan fold‐thrust belt in the 1905 Kangra earthquake zone: A critical taper model perspective for seismic hazard analysis

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