NDLI: Source study of two small earthquakes of Delhi, India, and estimation of ground motion from future moderate, local events

Content Provider	Springer Nature Link
Author	Bansal, B. K. Singh, S. K. Dharmaraju, R. Pacheco, J. F. Ordaz, M. Dattatrayam, R. S. Suresh, G.
Copyright Year	2008
Abstract	We study source characteristics of two small, local earthquakes which occurred in Delhi on 28 April 2001 (Mw3.4) and 18 March 2004 (Mw2.6). Both earthquakes were located in the heart of New Delhi, and were recorded in the epicentral region by digital accelerographs. The depths of the events are 15 km and 8 km, respectively. First motions and waveform modeling yield a normal-faulting mechanism with large strike-slip component. The strike of one of the nodal planes roughly agrees with NE–SW orientation of faults and lineaments mapped in the region. We use the recordings of the 2004 event as empirical Green’s functions to synthesize expected ground motions in the epicentral region of a Mw5.0 earthquake in Delhi. It is possible that such a local event may control the hazard in Delhi. Our computations show that a Mw5.0 earthquake would give rise to PGA of ~200 to 450 gal, the smaller values occurring at hard sites. The estimate of corresponding PGV is ~6 to 15 cm/s. The recommended response spectra, Sa, 5% damping, for Delhi, which falls in zone IV of the Indian seismic zoning map, may not be conservative enough at soft sites for a postulated Mw5.0 local earthquake.
Starting Page	89
Ending Page	105
Page Count	17
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	13
Issue Number	1
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-08-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Delhi seismicity Delhi seismotectonics Delhi seismic hazard Delhi microzonation Geotechnical Engineering Hydrogeology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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