Earthquake, Tsunami Hazards lurk offshore of Southern California, Geologists say (+Video)
Earthquake, Tsunami Hazards lurk offshore of Southern California, Geologists say
While their attention may be inland on the San Andreas Fault, residents of coastal Southern California could be surprised by very large earthquakes – and even tsunamis – from several major faults that lie offshore, a new study finds.
The latest research into the little known, fault-riddled, undersea landscape off of Southern California and northern Baja California has revealed more worrisome details about a tectonic train wreck in the Earth’s crust with the potential for magnitude 7.9 to 8.0 earthquakes. The new study supports the likelihood that these vertical fault zones have displaced the seafloor in the past, which means they could send out tsunami-generating pulses towards the nearby coastal mega-city of Los Angeles and neighboring San Diego.
“We’re dealing with continental collision,” said geologist Mark Legg of Legg Geophysical in Huntington Beach, California, regarding the cause of the offshore danger. “That’s fundamental. That’s why we have this mess of a complicated logjam.”
Little-known quake, tsunami hazards lurk offshore of Southern California – PHYSORG
Read more here: http://phys.org/news/2015-05-little-known-quake-tsunami-hazards-lurk.html
AMERICAN GEOPHYSICAL UNION
http://news.agu.org/press-release/little-known-quake-tsunami-hazards-lurk-offshore-of-southern-california/
This map shows the California Borderland and its major tectonic features, as well as the locations of earthquakes greater than Magnitude 5.5. The dashed box shows the area of the new study. Large arrows show relative plate motion for the Pacific-North America fault boundary. The abbreviations stand for the following: BP = Banning Pass, CH = Chino Hills, CP = Cajon Pass, LA = Los Angeles, PS = Palm Springs, V = Ventura; ESC = Santa Cruz Basin; ESCBZ = East Santa Cruz Basin Fault Zone; SCI = Santa Catalina Island; SCL = San Clemente Island; SMB = Santa Monica Basin; SNI = San Nicolas Island. Credit: Mark Legg
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