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Contrary to Previous Belief, Strike-Slip Faults Can Generate Large Tsunamis


Credit: Image courtesy of Costas Synolakis
On September 28, 2018, an inexplicably large tsunami devastated the Indonesian coastal city of Palu and several others nearby. Between the tsunami and the magnitude 7.5 earthquake that caused it, some 4,340 people were killed, making it the deadliest earthquake that year.
The tsunami’s waves reached around six meters high, which was a shock to geophysicists who had believed that earthquakes along a strike-slip fault could only trigger far smaller tsunamis for that particular region. Now, new research describes a mechanism for these large tsunamis to form, and suggests that other coastal cities that were thought to be safe from massive tsunamis may need to reevaluate their level of risk. ....

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Fifty Years Ago, A Major Earthquake Shifted the Course of Seismology in SoCal


Fifty Years Ago, A Major Earthquake Shifted the Course of Seismology in SoCal
February 9, 2021Caltech
The 1971 San Fernando quake led the USGS and Caltech to join forces, expanding seismic monitoring through the region
February 9 marks 50 years since the devastating 1971 San Fernando earthquake that rocked Los Angeles. The magnitude-6.6 temblor was the worst the region had experienced for decades. But out of the tragedy came a period of tremendous advances in earthquake science and also in increasing public safety during earthquakes in Southern California.
Just seconds after 6 a.m. on February 9, 1971, a 12-mile section of an under-appreciated fault along the San Gabriel Mountains suddenly and dramatically slipped. The entire Los Angeles region was rattled, but the shaking was particularly violent in the northeastern corner of the San Fernando Valley. By its end, two large hospitals (including one that was just months old) lay destroyed, powerlines had fallen, gas ....

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