Multidisciplinary studies of the seismicity and surface rupture related

Multidisciplinary studies of the seismicity and surface rupture related

Sesión Especial
Reunión Anual 2010, UGM
Multidisciplinary studies of the seismicity and
surface rupture related to the M7.2 April 4, 2010 El
Mayor-Cucapah earthquake
The M7.2 April 4, 2010 El Mayor-Cucapah earthquake represents the largest
moment release for this segment of the Pacific-North American plate margin in
more than 100 years. The primary surface rupture and seismicity are distributed
along a complex fault network and extends ~100 km from the northern tip of the
Gulf of California to the international border. All of the faults with primary rupture
are located west of the main plate-boundary fault system that comprises the CerroPrieto releasing bend, and many of them were unrecognized prior to this event.
Several important segments of the rupture were first identified by INSAR and other
remote sensing techniques and later confirmed by aerial and field surveys.
Ruptured master faults vary significantly in orientation and important segments are
controlled by normal-dextral faults that dip at very shallow angles (<30 degrees).
Seismologists recognize at least two major sub-events, and source modeling
requires multiple fault planes with distinct orientations and kinematics. This session
is convened to provide a forum for presenting multidisciplinary studies to better
understand the geodynamics of rupture propagation through a complex network of
high- and low-angle faults that operate together to accommodate the threedimensional strain of Pacific-North American plate margin shearing.
John Fletcher
División de Ciencias de la Tierra, CICESE
[email protected]
Javier González
División de Ciencias de la Tierra, CICESE
[email protected]
Tom Rockwell
Department of Geological Sciences, SDSU
Unión Geofísica Mexicana, Reunión Anual 2010
Noviembre 7-12, 2010, Puerto Vallarta, Jalisco, México