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New paleoseismic data from the northern San Jacinto Fault Zone, southern California Nate Onderdonk (CSULB) Tom Rockwell (SDSU) Sally McGill (CSUSB) Gayatri.

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Presentation on theme: "New paleoseismic data from the northern San Jacinto Fault Zone, southern California Nate Onderdonk (CSULB) Tom Rockwell (SDSU) Sally McGill (CSUSB) Gayatri."— Presentation transcript:

1 New paleoseismic data from the northern San Jacinto Fault Zone, southern California Nate Onderdonk (CSULB) Tom Rockwell (SDSU) Sally McGill (CSUSB) Gayatri Marliyani (SDSU) Funded by SCEC

2 2 topography along the fault zone (google earth?) 2 Image from Site Location- northern San Jacinto fault zone San Andreas Fault San Jacinto Fault

3 Mystic Lake Site

4

5

6 Mystic Lake site seen in 1940 Air Photo

7 NESWsoutheast wall

8 3 more shallow trenches in saw same relationships. Trench 6 Trench 7

9 Depositional model 1. Event on SW fault strand causes subsidence 2. Sag fills with clay, silt, sand 3. Soil layer develops 4. Repeat NESWsoutheast wall

10 Years AD

11 Mystic Lake events normalized probability density functions Recurrence Interval= 159 to 210 years

12 Comparing Mystic Lake events to Hog Lake record ? ?

13 Comparison with SAF record

14 Comparison with Wrightwood record

15 Conclusions Mystic Lake is a great source of paleoseismic info for the SJF and has potential for a long record Shallow trenches show evidence for 7 events in past 1700 years (avg. RI = 185 years) Non-Conclusions Some events may correlate with Hog Lake events? and maybe Wrightwood as well? if so: San Jacinto step-over is not a segment boundary, and neither is juncture with SAF

16 400m long trench

17 Correlated stratigraphy across the entire sag SW fault zone is locus of activity


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