The 2003 Boumerdes, Algeria earthquake: Regional moment tensor analysis

Details The 2003 Boumerdes, Algeria earthquake: Regional moment tensor analysis The 2003 Boumerdes, Algeria earthquake: Regional moment tensor analysis

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3206305b&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 6, CiteID L06305

Physics

13

Seismology: Earthquake Source Observations (1240), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Tectonophysics: Dynamics: Seismotectonics, Tectonophysics: Plate Boundary: General (3040)

Scientific paper

We used regional broadband seismograms to determine seismic moment tensors for the destructive May 21, 2003 Boumerdes (Algeria) Mw = 7.0 earthquake and its larger aftershocks. Fully automatic inversions using near-real time data provided solutions for seven Mw >= 4.7 events within 90 minutes after event occurrence. After adding off-line data, we manually obtained 30 solutions (Mw >= 3.8) from May 2003 to January 2004. All have shallow source depths (6-21 km). The median P-axis orientation (338°) of 24 thrust and four strike-slip events is consistent with Africa-Eurasia plate motion (330°). The main shock hypocenter at 8-10 km depth at the coastline and its shallow southward dip (25° +/- 5°) puts the fault surface trace 15-20 km offshore, consistent with documented seafloor deformation at the base of the continental slope. A main shock rupture length of about 50 km is deduced from first day aftershocks and location of strike-slip events. The strike-slip events probably define the western rupture end and indicate a left-step of main convergence. Fault strike variability of thrust events suggests fault orientation changes and possibly fault segmentation.

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