The Geotechnical Extreme Events Reconnaissance (GEER) report for the moment magnitude 7.7 earthquake that struck the Mexican State of Michoacan on September 19, 2022 is now available. The earthquake was an interface subduction earthquake along the Middle America trench megathrust near the central Pacific coast of Mexico. Approximately 6,000 houses were damaged, as were 116 schools. There were two fatalities attributed to a building collapse in the earthquake and another two fatalities in a M6.9 aftershock several days later. The report can be downloaded from the GEER association.
October 17 was the 18th anniversary of the 6.9 magnitude Loma Prieta earthquake that struck the Bay area. But a recent story by the Bay Area’s local ABC affiliate, ABC7, chose to focus on another earthquake, a 1868 earthquake of about the same magnitude that occurred on the Hayward Fault. According to the USGS, the Hayward Fault has a return period of about 140-years and "It’s the most heavily urbanized fault in the U.S. and it’s just waiting to go off…" Next year will be the 140-th anniversary of the last earthquake on the Hayward Fault. At some point it has the potential to be a very bad earthquake there. More after the break. (Photo by sanbeiji)
Some new research on the Newmark Displacement Method for earthquake-induced landslides indicates that the method may be on the unconservative side. The Landslide Blog provides a short summary of the paper by Li et al. (2018) that was recently […]