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The Sierra Madre fault, along the southern flank of the San Gabriel Mountains in the Los Angeles region, has failed in magnitude 7.2 to 7.6 events at least twice in the past 15,000 years. Restoration of slip on the fault indicates a minimum of ~4.0 m of slip from the most recent earthquake and suggests a total cumulative slip of ~10.5 m for the past two prehistoric earthquakes. Large surface displacements and strong ground-motions resulting from M > 7 earthquakes within the Los Angeles region are not yet considered in most seismic hazard and risk assessments.
Rubin warns that damage from large magnitude earthquakes along the Sierra Madre fault would be substantially different from that produced in the 1994, 6.7 Northridge earthquake. "Unlike the Northridge earthquake, that ruptured northward away from the metropolitan region, a magnitude 7+ earthquake on the Sierra Madre fault would rupture southward, directing energy into the densely populated basin," he says. "Large surface displacements, as well as strong ground-motions, have the potential for disrupting lifeline systems (roads, rail, phone, power and water) and producing significant damage to modern buildings," Rubin reports. "Until our recent excavation work, earthquake researchers didn't have any direct evidence about how big the reverse faults in this area could be -- we had no clue until now that an earthquake of a magnitude 7.5 had ever occurred in the region," he says. "This work really changes that. This is direct evidence that earthquakes in the region have been substantially larger than ever before documented -- and suggests that they could happen again," Rubin warns. Rubin has done extensive earthquake research in California for more than seven years. His most recent study was partially supported by grants from the Southern California Earthquake Center and the National Science Foundation.
Originally posted by berkeleygal
reply to post by tmiddlebrook36
Thanks for more info TM!
OK gang, whoever is in the LA Area, please try to record that program for us, somehow!
One thing scientists were able to determine was, this was not a single fault zone slippage....Among the Dozen or so other fault zones ruptured, were the Johnson Valley, Landers, Homestead Valley, Emerson, and the Camp Rock Fault zones.....The quake was preceded a few months earlier by the Joshua Tree M6.3 earthquake on April 22.....A aftershock sequence followed and consisted of thousands of tremors, including 143 quakes registered M4.0 or stronger, 19 of which measured M5.0 or stronger.....The most recent moderate aftershock was the Joshua Tree M5.0 earthquake on May 14, 1999.
The paper attempts to identify ionospheric parameters in association with earthquake at anomaly crest station through VHF Radio Beacon data and ground based ionosonde measurements while the Total Electron Content (TEC) parameters from RB observations are based mainly on data taken over Guwahati (26.2°N, 91.75° E), foF2 data used in the analysis were collected at Ahmadabad (23.01°N, 72.36°E). The paper describes methods and techniques adopted to examine modifications on these parameters if any, due to earthquake preparatory processes at equatorial anomaly crest stations. The mechanism of inducement of density changes in the ionosphere is sought through the generation of strong fountain effect possibly by the development of electric field during the earthquake preparatory process.
The two branches of the Sierra Madre Fault shown here. The solid line near the circled "24" is the southern branch while the northern branch is the dashed line near the circled "25". (in "Recent Reverse Faulting in the Transverse Ranges, California", Crook, et al., 1987, USGS Professional Paper 1339)
Originally posted by favouriteslave
Is this the same type of map? TEC, global?
www.swpc.noaa.gov...
www.ips.gov.au...edit on 28-9-2011 by favouriteslave because: (no reason given)
Originally posted by kdog1982
Originally posted by favouriteslave
Is this the same type of map? TEC, global?
www.swpc.noaa.gov...
www.ips.gov.au...edit on 28-9-2011 by favouriteslave because: (no reason given)
Yes,in a way.But they have computers and satellites not available to the public which does a more precise calculation over a specific area in much more detail.
Those maps are from what the sun is sending us.What they are talking about is what is released from the earth,which is not shown.
redirect your attention to spreading the word.