HR: 1340h
AN: S13A-1058    [Abstracts]
TI: The Mozambique Earthquake Sequence of 2006: High-Angle Normal Faulting in Southern Africa
AU: * Yang, Z
EM: zyang1@uiuc.edu
AF: University of Illinois at Champaign-Urbana, 1301 W. Green St. NHB245, Urbana, IL 61801, United States
AU: Chen, W
EM: wpchen@uiuc.edu
AF: University of Illinois at Champaign-Urbana, 1301 W. Green St. NHB245, Urbana, IL 61801, United States
AB: We report source mechanisms for the six largest shocks of the Mozambique earthquake sequence of February 22, 2006. The main shock of this sequence is one of the largest (Mw = 7) to occur in Africa over the past 40 years and its P-waveforms alone are sufficient to show that north-south trending normal faulting near the surface continues to depths of more than 15 km along an exceptionally steep dip of 76¡ã+/-4¡ã; so globally seismogenic normal faulting spans a wide range of dip from about 30¡ã to 75¡ã. S-waveforms, when combined with a minor component of left-lateral slip observed in the field, indicate the rake to be between -80¡ã and -89¡ã which, in turn, places a new constraint on relative plate motions: Complications from a nonspecific Rovuma micro-plate notwithstanding, our results favor the Euler pole between Somalia- and Nubia-plates to lie southward of the epicenters.
DE: 8109 Continental tectonics: extensional (0905)
DE: 8118 Dynamics and mechanics of faulting (8004)
DE: 8123 Dynamics: seismotectonics
SC: Seismology [S]
MN: 2007 Fall Meeting