Abstract
Earthquake slip history and moment release are best resolved using long period seismic waves, but details in the rupture process, such as sharp changes in rupture velocity or direction, can be imaged more clearly using higher frequency waves. Here, we investigate the slip and the high‐frequency radiation histories of the 2010 El Mayor‐Cucapah, Baja California, Mexico earthquake (Mw 7.2). The slip distribution inferred from inversion of strong motion data between 0.02 and 0.25 Hz indicates northwest propagating rupture, followed by bilateral rupture for 40 s. The sources of high‐frequency radiation between 0.3 and 2 Hz inferred from back‐projection analysis using teleseismic data are adjacent to, but not within, the high‐slip patches from the finite slip model in time and space. This implies relatively smooth rupture during the times and regions of maximum moment release. As theoretical models have predicted, high‐frequency radiation seems mostly associated with changes in rupture velocity or slip magnitude. Strong high‐frequency radiation is also found where the rupture propagated to a branch fault 50‐km northwest of the hypocenter. Complementary constraints on both fault slip and high‐frequency radiation provide increased understanding of earthquake rupture mechanics and may help improve strong motion evaluation at high frequencies.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.