indoâ€“us workshop on â€œintraplate seismicityâ€ - The CERI Blog

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The essence of seismology lies in the observation and interpretation of earthquakes in terms of seismicity, seismological characteristics, source parameters and the source processes. There is a continuing need to improve knowledge on the intra-‐plate as well as on the inter-‐plate seismicity. The information that are extracted from seismograms need to be reviewed and expanded so as to provide the best possible analysis and interpretation. Thus methods for seismological interpretation need to make an account of the Earth complexities, development of seismic modeling and intensive computation that has benefited greatly from advances in computer technology. Most earthquakes in continental areas require an understanding of the distribution of seismicity and faults beyond; how the structural and tectonic setting condition earthquakes of various kinds of geological, geophysical and seismological phenomena. This session discusses all aspects of the collection, analysis and interpretation of seismological data in intra-‐plate and inter-‐plate seismic environments. Session Chairman: Rufus D. Catchings Co-‐Chairman: Pradeep Talwani S2.1 Recent Intra-‐plate Earthquakes in India: Crustal Structures and Seismic Source Processes J. R. Kayal (Email: jr.kayal@gmail.com) CSIR Emeritus Scientist, Jadavpur University, 73/B, Thakurpur, Kolkata 700032, India A review of crustal structures and tectonic processes of the recent intra-‐plate earthquakes that caused severe damages and large casualties during the last decades in peninsular India is presented here. Chronologically these events are the 1993 Killari earthquake (mb 6.3, intensity VIII+) and the 1997 Jabalpur earthquake (mb 6.0, intensity VIII) in the central part and the 2001 Bhuj earthquake (Mw 7.7, intensity X) in the western part of the peninsular shield area. Detailed macroseismic data as well as aftershock data recorded by temporary microearthquake networks were well studied, and these data are further analysed and re-‐ examined in this study. The 1993 Killari event, a typical shallow (depth
aftershock decay rates, on the other hand, are found to be slower compared to the inter-‐ plate earthquakes in the Himalaya. The b-‐value and fractal dimension characteristics differ from shallow shield seismicity to deeper paleo-‐rift seismicity within the shield area. The seismic tomography well imaged 3-‐D crustal velocity structures, low velocity intersecting active fault zones and high velocity main shock source zones at the ‘fault ends’ at depths. S2.2 A Comparison of Intraplate and Interplate Seismic Wave Propagation (Peak Ground Velocity) R.D. Catchings (Email: catching@usgs.gov) US Geological Survey, 345 Middlefield Rd., MS 977, Menlo Park, CA 94025. The recent 23 August 2011 M 5.8 Virginia earthquake in the eastern United States (US) was reportedly felt from Florida (~900 km) to Canada (~1200 km) and as far west as Chicago (~900 km). This earthquake demonstrated that relatively moderate magnitude intraplate earthquakes in the eastern United States are generally felt over much greater distances than similar-‐magnitude interplate earthquakes in the western United States. For example, a typical M 5.8 to 6.0 earthquakes in California is seldom felt more than 400 km from its epicenter, whereas typical Central and Eastern US earthquakes are often felt to epicentral distances of 1000 to 1200 km (http://earthquake.usgs.gov/earthquakes/dyfi/archives). Because reported (Modified Mercalli Intensity -‐ MMI) and instrumentally recorded shaking (Peak Ground Velocity -‐ PGV) is strongly correlated (Atkinson and Kaka, 2007), such reports of distant shaking are a good indicator of regional variations in PGV. Earlier studies suggested that PGV is higher for intraplate (Eastern US) earthquakes than for interplate (Western US) earthquakes, owing to greater stress drops, hypocentral depths, and Q in the intraplate settings. However, more recent studies indicate that there are not significant differences in stress drop and hypocentral depths, with stress drops about the same and hypocentral depths shallower in the Eastern US (Hanks and Johnson, 1992). Studies also show that it is difficult to differentiate between the effects of stress drop and attenuation on PGV using most strong ground motion data (Boore et al., 2010).
Page 1 and 2: INDO-US WORKSHOP ON “INTRAPLATE S
Page 3 and 4: IUSSTF solicits proposals for its a
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Page 7 and 8: The USGS and several agencies of In
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Page 15 and 16: not been a significant earthquake i
Page 17 and 18: earthquake-‐triggered landslide
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Page 21 and 22: would require lesser stress/strain
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Page 27 and 28: Heat flux and crustal temperatures
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Page 37 and 38: S2-‐P1 Study of Source Paramete
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indoâ€“us workshop on â€œintraplate seismicityâ€ - The CERI Blog

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indoâ€“us workshop on â€œintraplate seismicityâ€ - The CERI Blog