IASPEI - Picture Gallery

25.01.2015 Views
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS004 1893 - 1904 Symposium Non-instrumental seismometry - Quantification of past and future earthquakes: balancing the geological, historical and contemporary strain records Convener : Dr. Gianluca Valensise General scopes related to Symposia on Non-instrumental seismometry. During the past 20 years, the seismic hazard assessment practice has increasingly relied on the quantification of past and future seismicity based on non-instrumental disciplines such as active tectonics, paleoseismology, historical seismology. Over the years, these diciplines have been turned from merely descriptive to progressively more quantitative. Quantification involves not only significant parameters of the earthquake source for recent and more distant earthquakes (e.g. fault location, fault length, coseismic slip, rupture complexity), but also the rate of earthquake production and recurrence properties of a fault, the development of segmentation models, the description of the geometric conditions leading to dynamic triggering. The symposium intends to acknowledge the enormous progress achieved in this area of seismology in recent years and particularly since the mid-1990s, emphasize their mutual relationships and show how they integrate with conventional instrumental methods. Due to its long-standing tradition in the analysis of the historical earthquake record and to its contribution to the development of methodologies in earthquake geology, Italy qualifies as an especially appropriate country to take a leading role in this symposium. This is the first of four related symposia: JSS004, JSS005, JSS006, JSS007. Below the scopes of JSS004. One of the outstanding issues in modern seismic hazard assessment practice is the comparison of the earthquake record with the geologic and geodetic evidence for ongoing tectonic strain. The correct estimation of past earthquakes on the one hand and of geologic and tectonic parameters on the other hand forms the basis for assessing the maximum credible earthquake, the size of impending earthquakes, and the expected rate of earthquake production in any given region. Significant over- or under-estimations of the earthquake potential may derive from such diverse conditions as source complexity during historical earthquakes, poor assessment of fault size, dynamic fault interaction, failed identification of active fault trends, and aseismic creep. This session intends to draw on scientists from different lines of expertise who are willing to cross conventional disciplinary boundaries and compare their approaches, results and residual uncertainties. We especially welcome contributions from these areas, or contributions that combine them into unconventional schemes: - quantification of the historical earthquake record; - quantification of the geologic record, including field studies of cumulative tectonic strain and the development of fault segmentation schemes; - partitioning of geodetically-derived strain onto individually identified or areal active tectonic structures. Papers are expected to emphasize the impact of the proposed results or approaches in the improvement of i) the understanding of the seismic cycle of major faults, and of ii) mid- to long-term seismic hazard estimates.

IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS004 Oral Presentation 1893 Re-evaluation of historical catalogues in the Indian Region. Dr. Hari Narain Srivastava SEISMOLOGY GLOBAL HYDROGEOLOGICALSOLUTIONS IASPEI Historical earthquake catalogues in the Indian Region were generally based on the felt reports published in the News Papers, writings of Courts and Historians, archaeological, and Paleo seismological investigations. Many new damaging earthquakes ranging in seismic intensity from VIII to XII on MM scale were added in the catalogue based on the above. However, closer examination of some of these earthquakes has brought out discrepancies in the time, of occurrence and in some cases even their location. During the early instrumental era, recent re-interpretation of the great Kangra earthquake of 1905 in western Himalaya based on limited seismological data has raised many questions, due to the inference about two earthquakes one in Kangra and the other near Dehradun. Further look at the data has reaffirmed the occurrence of only one earthquake of 1905 in Kangra. The other inferred earthquake near Dehradun was only a consequence of site response called secondary meizoseismal area similar to that observed during great earthquakes of Bihar Nepal (1934), Bhuj (2001) and Mexico (1985). The historical earthquakes based on limited data often requires a more closer look which can be undertaken only if old the seismograms are preserved for new researches. Microfilming of historical earthquakes was initiated in India Meteorological Department. This was in accordance with the first phase of IASPEI. Program on Historical seismograms and earthquakes. However, the slow methodology and problems in their preservation has now led to the modern method of digital scanning of the record. New results have been discussed based on historical data on Indian earthquakes. Keywords: historical, earthquakes, india

Page 1 and 2: IASPEI INTERNATIONAL ASSOCIATION OF

Page 3 and 4: IUGG XXIV General Assembly July 2-1






























































































Page 191: IUGG XXIV General Assembly July 2-1



























































































































































































































































































Page 759: Published and Distributed by USMA 2

iaspei

tsunami

seismic

earthquake

physics

seismology

assembly

iugg

perugia

xxiv

IASPEI - Picture Gallery

IASPEI - Picture Gallery ... View more IASPEI - Picture Gallery

Delete template?

Save as template ?

IASPEI - Picture Gallery IASPEI - Picture Gallery