Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
Abstract (EDOC: 14445)
Knowledge of the seismicity distribution gives a great contribution to understand the processes at transform faults. The analysis of the regional network catalog (Begin & Steinitz, 2005) could not produce a clear image of the distribution of the seismicity. Furthermore, the seismic energy release over the 20 years suggests a continuous decrease of the seismic activity. Therefore, a very dense (station distance 2 - 5km) local seismological network was operated in the southern Dead Sea area within the framework of the international project DESIRE (Dead Sea Integrated Research Project). During its operation time more than 500 local events were registered, which is about five times more than previously estimated. These events give a detailed picture of the distribution of seismicity. The mainly microseismic activity is generally concentrated on the eastern and western faults limiting the Dead Sea basin (DSB). Most of the seismic events occurred in the uppermost 15 km, while the overall depth limit was at 30km. One of the dominant features observed in the dataset was a cluster of 115 earthquakes, occurring in February 2007. For precise relative locations of the events in the cluster Double-Difference location HypoDD (Waldhauser 2001) procedure was applied. We observe a vertical distribution of the events in the cluster. Very shallow events are found in the center of the study area. They are related to activity of the Lisan salt dome beneath that area. Furthermore, the local events were used to refine the picture of the P- and S- wave velocity distribution.
(2009): Seismicity as a key to Understanding the Dead Sea Transform Fault – Results From a Temporary Dense Seismic Network in the Southern Dead Sea Basin. AGU 2009 Fall Meeting (San Francisco 2009).