8/31/2023 0 Comments Reflection lake san jacinto![]() 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.īody waves, Earthquake dynamics, Guided waves, Interface waves, Rheology and friction of fault zones, Continental tectonics: strike-slip and transform 1 INTRODUCTIONįault zone structures contain important information on various aspects of earthquake and fault mechanics ranging from long-term evolutionary processes to brittle rock rheology and dynamic stress fields operating during the occurrence of earthquakes (e.g. 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 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 P-wave velocity contrast across the local bounding bimaterial interface is 10–15 per cent. 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. 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. The teleseismic P waves travel faster beneath the TR than the JF array, in contrast to larger scale tomographic results. Delay times between phase arrivals associated with ∼3500 local earthquakes and nine teleseismic events are used to estimate velocity variations within the arrays. The 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.
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