Evidence for Seven Surface Ruptures in the Past 1600 Years on the Claremont Fault at Mystic Lake, Northern San Jacinto Fault Zone, California

Onderdonk, N.; Rockwell, T. K.; McGill, Sally F.; Marliyani, Gayatri Indah

doi:10.1785/0120120060

Cited by 34 publications

(36 citation statements)

References 30 publications

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“…1 and 2), which may or may not inhibit ruptures from propagating from one fault to the other. Similar timing of some prehistoric earthquakes on the Claremont fault and the Clark fault during the past 2000 yr led Onderdonk et al (2013Onderdonk et al ( , 2014 and to infer that some ruptures may have propagated through the releasing step over that separates these two strands of the San Jacinto fault zone. They also noted similar timing of earthquakes on the Claremont fault and the Mojave segment of the San Andreas fault zone, suggesting the possibility that ruptures propagated from the northern San Jacinto fault zone to the San Andreas fault zone, or vice versa (Onderdonk et al, , 2014Rockwell et al, 2014).…”

Section: Ruptures Across Discontinuities In a Fault Systemmentioning

confidence: 87%

“…We infer that the older ages are most probable based on the fact that there have also been two events recorded at the Mystic Lake paleoseismic site since A.D. 1643, but only one since A.D. 1779 ( Fig. 11; Onderdonk et al, 2013).…”

Section: Paleoseismic Data From Trenchmentioning

confidence: 89%

“…This most recent earthquake on fault C overlaps in time with event 12 at Mystic Lake ( Fig. 11; Onderdonk et al, 2013). Displacement of the active channel.…”

Section: Paleochannelmentioning

confidence: 89%

“…8; Onderdonk et al, 2013Onderdonk et al, , 2014. Event 4 at Mystic Lake occurred sometime between A.D. 1422 and A.D. 1444, which overlaps with the earlier time range of the avulsion event.…”

Section: Paleochannelmentioning

confidence: 99%

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Short-term variations in slip rate and size of prehistoric earthquakes during the past 2000 years on the northern San Jacinto fault zone, a major plate-boundary structure in southern California

2015

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Section: Ruptures Across Discontinuities In a Fault Systemmentioning

confidence: 87%

Section: Paleoseismic Data From Trenchmentioning

confidence: 89%

“…This most recent earthquake on fault C overlaps in time with event 12 at Mystic Lake ( Fig. 11; Onderdonk et al, 2013). Displacement of the active channel.…”

Section: Paleochannelmentioning

confidence: 89%

Section: Paleochannelmentioning

confidence: 99%

See 2 more Smart Citations

Short-term variations in slip rate and size of prehistoric earthquakes during the past 2000 years on the northern San Jacinto fault zone, a major plate-boundary structure in southern California

2015

Self Cite

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“…Palaeoseismic and historic records indicate that the SJFZ is capable of large (M w > 7.0) earthquakes (e.g. Petersen & Wesnousky 1994;Onderdonk et al 2013;Rockwell et al 2015) that pose significant seismic hazard to large urban areas in southern California. Allam & Ben-Zion (2012), Allam et al (2014a) and Zigone et al (2015) derived earthquake-and noise-based tomographic models for the region around the SJFZ.…”

Section: Introductionmentioning

confidence: 99%

Internal structure of the San Jacinto fault zone at Jackass Flat from data recorded by a dense linear array

Qiu

Ben‐Zion

Ross

et al. 2017

Geophysical Journal International

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S U M M A R YThe internal structure of the Clark fault in the trifurcation area of the San Jacinto fault zone is imaged using seismograms recorded by a dense linear array (Jackass Flat, JF) crossing the surface trace of the fault and an adjacent array (TR) to the SW. Delay times between phase arrivals associated with ∼3500 local earthquakes and nine teleseismic events are used to estimate velocity variations within the arrays. The teleseismic P waves travel faster beneath the TR than the JF array, in contrast to larger scale tomographic results. Statistical analysis of local P-wave delay times indicates that the entire JF array, with an aperture of ∼400 m, is inside a low-velocity damage zone. This low-velocity zone is bounded on the NE side by a shallow bimaterial interface generating fault zone head waves, and it contains an inner zone of more intense damage generating fault zone trapped waves. The P-wave velocity contrast across the local bounding bimaterial interface is 10-15 per cent. The trapping structure is associated with a width of ∼200 m, S-wave velocity reduction of ∼35 per cent with respect to the surrounding rock, Q-value of ∼20 and depth of ∼3.5 km. The imaging results suggest that the main seismogenic fault is near the SW end of the JF array, in agreement with a prominent geomorphologic feature. The existence of intense local damage on the crustal block with faster larger scale velocity at depth is consistent with common propagation of earthquake ruptures in the area to the NW.

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Paleoearthquakes at Frazier Mountain, California delimit extent and frequency of past San Andreas Fault ruptures along 1857 trace

Scharer

Weldon

Streig

et al. 2014

Geophysical Research Letters

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Large earthquakes are infrequent along a single fault, and therefore historic, well-characterized earthquakes exert a strong influence on fault behavior models. This is true of the 1857 Fort Tejon earthquake (estimated M7.7-7.9) on the southern San Andreas Fault (SSAF), but an outstanding question is whether the 330 km long rupture was typical. New paleoseismic data for six to seven ground-rupturing earthquakes on the Big Bend of the SSAF restrict the pattern of possible ruptures on the 1857 stretch of the fault. In conjunction with existing sites, we show that over the last~650 years, at least 75% of the surface ruptures are shorter than the 1857 earthquake, with estimated rupture lengths of 100 to <300 km. These results suggest that the 1857 rupture was unusual, perhaps leading to the long open interval, and that a return to pre-1857 behavior would increase the rate of M7.3-M7.7 earthquakes.

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Evidence for Seven Surface Ruptures in the Past 1600 Years on the Claremont Fault at Mystic Lake, Northern San Jacinto Fault Zone, California

Cited by 34 publications

References 30 publications

Short-term variations in slip rate and size of prehistoric earthquakes during the past 2000 years on the northern San Jacinto fault zone, a major plate-boundary structure in southern California

Short-term variations in slip rate and size of prehistoric earthquakes during the past 2000 years on the northern San Jacinto fault zone, a major plate-boundary structure in southern California

Internal structure of the San Jacinto fault zone at Jackass Flat from data recorded by a dense linear array

Paleoearthquakes at Frazier Mountain, California delimit extent and frequency of past San Andreas Fault ruptures along 1857 trace

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