Ch3

Ch 3: Characterization of the SFBR Earthquake Sources: 

Ch 3: Characterization of the SFBR Earthquake Sources Working Group on California Earthquake Probabilities, 2002

Overview: 

Overview Fault Segmentation Rupture Sources & Scenarios Geologic Slip Rates Previous Earthquakes Fault Area

Area covered by report: 

Area covered by report

Fault Segments: 

Fault Segments the shortest section considered capable of repeatedly rupturing to produce large earthquakes criteria: kinematic & dynamic kinematic: geometry, structure dynamic: rupture length, displacement of previous eqs, timing, changes in slip/creep rates, microearthquakes

Ruptures: 

Ruptures rupture source: single or combination of adjacent fault segments; floating eq rupture scenario: combination of rupture sources that describe mode of failure of the entire fault during one eq cycle rupture model: weighted combinations of the fault-rupture scenarios

Hayward-Rogers Creek Segments: 

Hayward-Rogers Creek Segments 140 km long 3 segments: 9±2 RC: 8.4±2, 235-387 HN: 10±1, 270-710 HS: 7-10, 150-250 N, 130±40 S Tule Pond creep 4-6 change in timing constraint from previous reports

Rupture Model Construction: 

Rupture Model Construction

San Andreas Segments: 

San Andreas Segments

Slide9: 

~260 ~300 ~150

San Gregorio Segments: 

San Gregorio Segments

Calaveras Fault Segments: 

Calaveras Fault Segments

Green Valley & Concord Faults: 

Green Valley & Concord Faults

Greenville Fault Segments: 

Greenville Fault Segments

Segment Dimensions: 

Segment Dimensions

Follow-up Papers: 

Follow-up Papers Segall, P., and Lisowski, M., 1990, Surface displacements in the 1906 San Francisco and 1989 Loma Prieta earthquakes: Science, v. 250, no. 4985, p. 1241-1244. Schwartz, D.P., Pantosti, D., Okumura, K., Powers, T., and Hamilton, J., 1998, Paleoseismic investigations in the Santa Cruz Mountains: Implications for the recurrence of large magnitude earthquakes on the San Andreas Fault: Journal of Geophysical Research, v. 103, p. 17,985-18,001. Thatcher, W., Marshall, G., and Lisowski, M., 1997, Resolution of fault slip along the 470-km- long rupture of the great 1906 San Francisco earthquake: Journal of Geophysical Research, v. 102, no. B3, p. 5353-5367. Lettis, W., 2001, Late Holocene behavior and seismogenic potential of the Hayward-Rodgers- Creek fault system in the San Francisco Bay area, California: Calif. Geol. Surv. Bulletin, v. 210, p. 167-178. C. Goldfinger et al., Rupture lengths and temporal history of significant earthquakes on the offshore and north coast segments of the Northern San Andreas Fault based on turbidite stratigraphy, Earth Planet. Sci. Lett. (2006).