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HOW ARE we “BLIND” TO some of our faults?

HOW ARE we “BLIND” TO some of our faults?. HANNAH SHAMLOO. Blind thrust faults. Some faults do not break through the surface anywhere along their length. http://earthsci.org/processes/struct/equake1/EQCaseHistories.html. Puente hills thrust fault. Recently discovered, 1999 Los Angeles Basin

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HOW ARE we “BLIND” TO some of our faults?

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  1. HOW ARE we “BLIND” TO some of our faults? HANNAH SHAMLOO

  2. Blind thrust faults • Some faults do not break through the surface anywhere along their length http://earthsci.org/processes/struct/equake1/EQCaseHistories.html

  3. Puente hills thrust fault • Recently discovered, 1999 • Los Angeles Basin • Runs about 40 km • Three segments • Slip rate 5mm/year • 4 Major E.Q.’s last 11,000 years http://www.scec.org/research/030404dolan.html

  4. DANGER Compared to Northridge… Northridge’s E.Q. directed strongest shaking towards N to sparsely populated mountains PHT fault focuses its shaking toward downtown LA LA Basin amplifies shaking 15x stronger energy release Viz Credits: AmitChourasia

  5. REFERENCES • Marquis, John. "New Study Reveals The Behavior Of The Puente Hills Thrust Fault." New Study Reveals The Behavior Of The Puente Hills Thrust Fault. Southern California Earthquake Center, 4 Apr. 2003. Web. 18 June 2013. • Maugh II, Thomas H. (May 26, 2005). "Big Fault Under L.A. Could Be Devastating". Los Angeles Times 26 May 2005. Web. 18 Jan. 2013 • Shaw, John H., Andreas Plesch, James F. Dolan, Thomas L. Pratt, and Patricia Fore. "Puente Hills Blind-Thrust System, Los Angeles, California." Thesis. N.d. Bulletin of the Seismological Society of America, 16 Nov. 2001. Web. 18 Jan. 2013.

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