HR: 1340h
AN: T43A-1078    [Abstracts]
TI: Continuous Seismic Monitoring by Permanent and Portable Seismic Networks of the Dead Sea Basin in the Last 25 years
AU: * Hofstetter, R
EM: rami@seis.mni.gov.il
AF: Geophysical Institute of Israel, PO Box 182, Lod, 71100, Israel
AU: Braeuer, B
EM: ben@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Asch, G
EM: asch@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Mohsen, A
EM: ayman@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AU: Amrat, A
EM: amrat@nra.gov.jo
AF: Natural Resource Authority, Eight Circle, PO Box 7, Amman, 14473, Jordan
AU: Jaser, D
EM: jso@nra.gov.jo
AF: Natural Resource Authority, Eight Circle, PO Box 7, Amman, 14473, Jordan
AU: Weber, M
EM: mhw@gfz-potsdam.de
AF: GeoForschungsZentrum, Telegrafenberg, Potsdam, 14473, Germany
AB: Seismic monitoring in the Eastern Mediterranean started at the end of the 19th century. Since then several strong events were instrumentally recorded in the Dead Sea rift in general and in the Dead Sea basin (DSB) in particular. The events in the DSB were mostly harmless except the fatal earthquake of July 11, 1927. The recent main shock in the northern Dead Sea basin earthquake, MW 5.1, on February 11, 2004, just reminded us of the potential of the occurrence of strong earthquakes in the DSB. The mainshock was followed by a relatively short sequence of aftershocks, which lasted for about a few months, and most of the aftershocks occurred in the first 6 weeks having small magnitudes. Two permanent seismic networks (JSO + ISN) and 3 temporary seismic networks (PSN + DESERT2000 + DESIRE) have monitored the seismicity in the DSB in the last 25 years. Small and moderate earthquakes in the Dead Sea basin, part of the Dead Sea rift, were recorded and analyzed. The earthquakes, of 0.5≤Md≤5.2, follow a normal rate of seismicity for the region with b values around 0.9. The recorded seismicity is mainly confined to the basin and its boundaries. The activity is along the north- south left lateral faults on the east and west boundaries of the basin, however, there is some clear activity along the transverse faults crossing the basin. In the Dead Sea basin we found a tendency to clustering, which is clearly demonstrated in very similar seismograms of several events recorded at the same station. Focal plane solutions of the strong earthquakes suggest a strike slip faulting. However, the focal mechanisms of the small events and aftershocks present a mixture of strike slip motion, normal and reverse faulting. Scaling relationships of moment- magnitude and other source parameters (stress drop, corner frequency) reveal similar results to those of California and other regions.
DE: 7200 SEISMOLOGY
DE: 7203 Body waves
DE: 7209 Earthquake dynamics (1242)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting