And the southern San Andreas as well. Northridge was one vivid example. 1994 6.7 quake, combination slip / thrust fault event which is why the devastation was so much.
The most costly American earthquake since 1906 struck Los Angeles on 17 January 1994. The magnitude 6.7 Northridge earthquake resulted from more than 3 meters of reverse slip on a 15-kilometer-long south-dipping thrust fault that raised the Santa Susana mountains by as much as 70 centimeters. The fault appears to be truncated by the fault that broke in the 1971 San Fernando earthquake at a depth of 8 kilometers. Of these two events, the Northridge earthquake caused many times more damage, primarily because its causative fault is directly under the city. Many types of structures were damaged, but the fracture of welds in steel-frame buildings was the greatest surprise. The Northridge earthquake emphasizes the hazard posed to Los Angeles by concealed thrust faults and the potential for strong ground shaking in moderate earthquakes.
Ya, not the same. Different kind of fault. 1994 not the San Andreas. M6.7 a whole different beast from a M7.7. A southern SAF rupture will be severe.
We are better prepared but this earthquake is an analog event to a northern San Andreas scenario.
And the southern San Andreas as well. Northridge was one vivid example. 1994 6.7 quake, combination slip / thrust fault event which is why the devastation was so much.
The most costly American earthquake since 1906 struck Los Angeles on 17 January 1994. The magnitude 6.7 Northridge earthquake resulted from more than 3 meters of reverse slip on a 15-kilometer-long south-dipping thrust fault that raised the Santa Susana mountains by as much as 70 centimeters. The fault appears to be truncated by the fault that broke in the 1971 San Fernando earthquake at a depth of 8 kilometers. Of these two events, the Northridge earthquake caused many times more damage, primarily because its causative fault is directly under the city. Many types of structures were damaged, but the fracture of welds in steel-frame buildings was the greatest surprise. The Northridge earthquake emphasizes the hazard posed to Los Angeles by concealed thrust faults and the potential for strong ground shaking in moderate earthquakes.
Here is a summary with a little more detail. These authors are knowledgeable and reputable. They also write this blog for general consumption. Bottom line- this is a bad situation. This strike-slip fault is somewhat analogous to the San Andreas or Alpine (NZ) faults, same sense of motion and similar rates of slip. The fault creates a valley where everyone lives, thus, big population centers are directly over the earthquake. The hypocenter was shallow, less than 10 km, so little energy was attenuated. To add to the problem, the valleys are full of loose (unconsolidated) sediment and prone to liquefaction. The fault has historic, large earthquakes but the infrastructure was not up to standards for that kind of shaking and foundation strength loss. We are better prepared but this earthquake is an analog event to a northern San Andreas scenario.
A magnitude 7.7 earthquake that struck March 28 in neighboring Myanmar turned this building in Bangkok, Thailand, into a mountain of collapsed concrete and twisted rubble, and a gargantuan task for rescue workers.
Little known fact, 1. Rob and I came from the same program and have been friends for years, 2. He is a master educator (not a little known fact). 3. Iâm retired but still active, dammit
Little known fact, 1. Rob and I came from the same program and have been friends for years, 2. He is a master educator (not a little known fact). 3. Iâm retired but still active, dammit
BTW our Geomorph has retired, leaving Rob Thomas as the guy to follow. A different Rob Thomas.
Little known fact, 1. Rob and I came from the same program and have been friends for years, 2. He is a master educator (not a little known fact). 3. Iâm retired but still active, dammit
Using information from inside the rocks on Earthâs surface, my colleagues and I have reconstructed the plate tectonics of the planet over the last 1.8 billion years.
It is the first time Earthâs geological record has been used like this, looking so far back in time. This has enabled us to make an attempt at mapping the planet over the last 40 percent of its history, which you can see in the animation below.
The work, led by Xianzhi Cao from the Ocean University in China, was recently published in the open-access journal Geoscience Frontiers.
would be kind of nice if they began at the start and worked forwards..
Using information from inside the rocks on Earthâs surface, my colleagues and I have reconstructed the plate tectonics of the planet over the last 1.8 billion years.
It is the first time Earthâs geological record has been used like this, looking so far back in time. This has enabled us to make an attempt at mapping the planet over the last 40 percent of its history, which you can see in the animation below.
The work, led by Xianzhi Cao from the Ocean University in China, was recently published in the open-access journal Geoscience Frontiers.
