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Reinvestigating the Mission Creek Fa...

Wersan, Louis Samuel.

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Reinvestigating the Mission Creek Fault: Holocene slip rates in the northern Coachella Valley and implications for southern California earthquake hazard assessment.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Reinvestigating the Mission Creek Fault: Holocene slip rates in the northern Coachella Valley and implications for southern California earthquake hazard assessment./
Author:	Wersan, Louis Samuel.
Description:	112 p.
Notes:	Source: Masters Abstracts International, Volume: 55-01.
Contained By:	Masters Abstracts International55-01(E).
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1599159
ISBN:	9781339053691

Reinvestigating the Mission Creek Fault: Holocene slip rates in the northern Coachella Valley and implications for southern California earthquake hazard assessment.
Wersan, Louis Samuel.

Reinvestigating the Mission Creek Fault: Holocene slip rates in the northern Coachella Valley and implications for southern California earthquake hazard assessment. - 112 p.

Source: Masters Abstracts International, Volume: 55-01.

Thesis (M.S.)--Indiana University, 2015.

Near San Gorgonio Pass the San Andreas fault zone encounters a structural knot which causes strain to be distributed regionally onto the San Jacinto fault and Eastern California Shear Zone and locally onto a series of evolving fault strands. Each strand was activated and subsequently abandoned as it became locked; current interpretations show that the Mission Creek fault was the dominant strand in the early Pleistocene before being abandoned in favor of the presently active Banning fault. Recent slip rate investigations along the Mission Creek fault have challenged this interpretation, however, and motivate new studies into strain distribution through San Gorgonio Pass and mechanisms of strain transfer to the Eastern California Shear Zone. It is therefore essential to establish an accurate Holocene slip rate on the Mission Creek fault and revisit current interpretations of San Andreas fault zone kinematics.

ISBN: 9781339053691Subjects--Topical Terms:

516570
Geology.

Reinvestigating the Mission Creek Fault: Holocene slip rates in the northern Coachella Valley and implications for southern California earthquake hazard assessment.
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100 1 $a Wersan, Louis Samuel. $3 3192837
245 1 0 $a Reinvestigating the Mission Creek Fault: Holocene slip rates in the northern Coachella Valley and implications for southern California earthquake hazard assessment.
300 $a 112 p.
500 $a Source: Masters Abstracts International, Volume: 55-01.
500 $a Includes supplementary digital materials.
500 $a Adviser: Julie Fosdick.
502 $a Thesis (M.S.)--Indiana University, 2015.
520 $a Near San Gorgonio Pass the San Andreas fault zone encounters a structural knot which causes strain to be distributed regionally onto the San Jacinto fault and Eastern California Shear Zone and locally onto a series of evolving fault strands. Each strand was activated and subsequently abandoned as it became locked; current interpretations show that the Mission Creek fault was the dominant strand in the early Pleistocene before being abandoned in favor of the presently active Banning fault. Recent slip rate investigations along the Mission Creek fault have challenged this interpretation, however, and motivate new studies into strain distribution through San Gorgonio Pass and mechanisms of strain transfer to the Eastern California Shear Zone. It is therefore essential to establish an accurate Holocene slip rate on the Mission Creek fault and revisit current interpretations of San Andreas fault zone kinematics.
520 $a In support of this goal, detailed fault and quaternary unit mapping was conducted in two field areas along the Mission Creek fault in the northern Coachella Valley. Separated by &sim;3 km, the two field areas allow for characterization of along-strike changes in Mission Creek fault behavior and interaction with regional faults. Nineteen samples were collected from dextrally offset landforms for Terrestrial Cosmogenic Nuclide (TCN) dating. TCN dating measures the total concentration of in situ produced 10Be, which is proportional to exposure age of the surface. TCN surface dates therefore provide the age constraint for accurate Holocene-Late Quaternary slip rate analysis.
520 $a Dated surfaces within Big Morongo Canyon field area yield preliminary TCN ages of 8 ka and 20 ka in locations that record 88-97 m and 31-37 m of dextral displacement, respectively. Based on the calculated dates and measured offsets, local slip rates are calculated to be 11.4-14.0 mm/yr, which is significantly faster than previously estimated rates on the Mission Creek fault in the northern Coachella Valley. Constraining active slip on the Mission Creek fault has significant implications for southern California fault modeling and earthquake hazard assessment, and allows quantification of maximum strain transfer in the Coachella Valley from the Mission Creek fault to the Eastern California Shear Zone (&sim;9 mm/yr).
590 $a School code: 0093.
650 4 $a Geology. $3 516570
650 4 $a Geophysics. $3 535228
650 4 $a Geomorphology. $3 542703
690 $a 0372
690 $a 0373
690 $a 0484
710 2 $a Indiana University. $b Geological Sciences. $3 3168413
773 0 $t Masters Abstracts International $g 55-01(E).
790 $a 0093
791 $a M.S.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1599159