HomeMy WebLinkAbout04. (Handout) Concord Fault Seismic History and Design CriteriaItem 4.
(Committee Handout)
CONCORD FAULT SEISMIC HISTORY
AND DESIGN CRITERIA
• Limited data exists for Concord Fault
• Last recorded activity on fault in October 24, 1954, with
Magnitude 5.4 earthquake
• Design Criteria
Magnitude 6.7 Mw
10% chance of earthquake in next 50 years
• USGS Research Data corroborates criteria
Concord fault section: 6.5 Mw w/110 yrs. recurrence
Green Valley fault section: 6.7 Mw w/150 yrs.
recurrence
Combined fault: 6.9 Mw w/180 yrs. recurrence
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