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.
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GEER Report Released for 2018 Anchorage Earthquake
The Geotechnical Extreme Events Reconnaissance (GEER) Association has released Version 1.0 of their report for the November 30, 2018, M7.0 Anchorage Earthquake. The GEER Phase I team collaborated closely with a number of other agencies […]
The Claremont Tunnel – Designed to Survive Fault Rupture on the Hayward Fault
The Claremont tunnel beneath the Berkeley Hills on the east side of Oakland is a water supply tunnel that serves over 800,000 customers in Richmond, Oakland, San Leandro and neighboring communities. One of the unique things about the tunnel is that it crosses the active Hayward Fault. Most of the time when you talk about designing for earthquakes you’re talking about designing to withstand the seismic forces. In this case, the designers needed the water transmission tunnel to withstand up to 7.5-ft of offset due to fault slip and still maintain a minimum level of service. (Photo credit: Sue Bednarz, Jacobs Associates, Inc. by way of Civil Engineering Magazine)
This post describes the relatively recent Claremont Tunnel Seismic Upgrade Project as reported in Civil Engineering Magazine (May 2008, v. 78, no. 5, pp 58-63, 96-97).