The magnitude 7.8 earthquake in Kaikoura New Zealand in 2016 caused over 50 landslides along State Highway 1, north and south of the Town. The team of engineers tasked with reopening the corridor to road and rail traffic needed a rockfall barrier system with a small footprint and wanted to incorporate precast blocks being used elsewhere on the corridor for other purposes. They contacted Holmes Solutions to do a full-scale impact test of the system. The precast concrete blocks are what you would see on the roadway side of the barrier. The back side of the barrier system consists of gabion baskets with some kind of sand layer in between the baskets and the blocks. Click on the video to see the outcome of the test!
A deadly magnitude 6.3 earthquake struck Christchurch, New Zealand on February 22, killing at least 147 and with around 200 still missing. Many buildings have been badly damaged or destroyed and residents also had to deal with large quanities of mud and water which was a result of the liquefaction. The same region was affected by a 7.1 magnitude quake in September of 2010. That earthquake was centered deeper and farther from the metropolitan area so there were fewer casualties and less damage. But many buildings that had recently been repaired, or were even still under repair were devastated once again. Some early reports were calling this earthquake an aftershock of the September earthquake, but maps I’ve seen (at right) show pretty clearly it was a different fault segment that ruptured during this earthquake. I have a collection of links below that might be of interest. My heart goes out to the people of New Zealand affected by this disaster.
From the USGS Newsroom:
USGS scientist Ken Hudnut fills us in on how science created the theoretical magnitude 7.8 earthquake behind the Great Southern California ShakeOut—the largest earthquake preparedness drill in U.S. history, coming Nov. 13—and what such an earthquake would do to downtown Los Angeles.
Seems like they did it right wiith this study. They had multiple teams independenlty come up with the ground shaking model, then had different structural engineers who are experts in seismic design of large buildings review the tall buildings in the L.A. area for the design earthquake. They say that buildings would likely come down in the 7.8 magnitude event. Click through to watch the video interview from the USGS.
The NSF funded Geotechnical Extreme Events Reconnaissance (GEER) team has provided a preliminary report and some amazing photos and video of the damage to various regions of Japan affected by the moment magnitude 9.0 earthquake that struck on March 11, 2011. Read on to see some amazing photos and video of the liquefaction damage related to the Tohoku Earthquake in Japan. (Photos from Oregon State Flickr)