Lecture7_2011.knr

The tale of two lakes salton sea west tahoe fault m73

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Unformatted text preview: , M7.3 Southern San Andreas M 7.8+ Lake Tahoe Lake Cauhilla TeraShake Project October 15, 2009 Brawley Seismic Zone ‘Xplained Brothers et al., 2009 Salton Soup First CHIRP data from the Salton Sea Scripps Institution of Oceanography Perks of the Job Salt Creek Trench Salt Creek Trench Lake Cahuilla Stratigraphy Expected Stratigraphy Beneath the Salton Sea (Based on Philibosian’s model) Sequences separated by transgressive surfaces A’ A Coachella Site (9 m) High-stand (13 m) Elevation (m) 0 A 20 40 60 A’ Salton Sea (-70 m) 80 L6 0 40 80 120 Distance (km) 160 Lake 6 Deep water deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) Elevation (m) 0 A 20 40 60 A’ Salton Sea (-70 m) F6 L6 80 0 40 80 120 Distance (km) 160 Short separation in high-stands Lake remains deep 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) Elevation (m) 0 L5 F6 L6 A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 Lake 5 Deep water deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) Elevation (m) 0 F5 L5 F6 L6 A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 150 year hiatus Shallow water/fluvial deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) L4 F5 L5 F6 L6 Elevation (m) 0 A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 Lake 4 Deep water deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) F4 L4 F5 L5 F6 L6 a 0 a Elevation (m) a A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 180 year hiatus Shallow water/fluvial deposits Very distinct in trench 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) L3 F4 L4 F5 L5 F6 L6 a 0 a Elevation (m) a A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 Lake 3 Deep water deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) High-stand (13 m) F3 L3 F4 L4 F5 L5 F6 L6 a 0 a Elevation (m) a A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 20 year hiatus Shoreline regression Subtle change 160 200 240 Building a Stratigraphic Framework Beneath the Salton Sea A’ A Coachella Site (9 m) L2 F3 L3 High-stand (13 m) F4 L4 F5 L5 F6 L6 a 0 a Elevation (m) a A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 Lake 2 Deep water deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea Coachella Site (9 m) High-stand (13 m) L4 F5 L5 F6 L6 a 0 a Elevation (m) a F4 A’ A F2 L2 F3 L3 A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 30 year hiatus Shoreline regression Subtle change 160 200 240 Building a Stratigraphic Framework Beneath the Salton Sea Coachella Site (9 m) High-stand (13 m) L4 F5 L5 F6 L6 a 0 a Elevation (m) a F4 A’ A L1 F2 L2 F3 L3 A 20 40 60 A’ Salton Sea (-70 m) 80 0 40 80 120 Distance (km) 160 Lake 1 Deep water deposits 200 240 Building a Stratigraphic Framework Beneath the Salton Sea F1 L1 F2 L2 F3 L3 Coachella Site (9 m) High-stand (13 m) L4 F5 L5 F6 L6 a 0 a Elevation (m) a F4 A’ A...
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