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California Fault Parameters
1996 Draft


SAN ANDREAS FAULT ZONE


This table presents the preliminary values used by the California Department of Conservation's Division of Mines and Geology and the U.S. Geological Survey for estimating seismic hazard in the State of California.

The information contained in this file is a DRAFT VERSION
and is available for REVIEW ONLY!
No other usage is authorized by the Department of Conservation.

This product is available from DMG Publications Sales in final form as DMG Open-File Report 96-08 for $25.00.

Fault Name and Geometry (1) Length
Slip Rate
Rank
(2)
Maximum Moment Magnitude
(3)
Moment Rate
(Newton-
meters/yr)
Charac-
teristic Return Interval

(yrs)
Down-
Dip Width

(km)
Dip
(deg.)
Magnitude Distribution Type (4) Segment Endpoint North
(Lon/Lat)
Segment Endpoint South
(Lon/Lat)
Comments
(km) +/- (mm/yr) +/-
San Andreas-
Coachella
(rl-ss)
95 10 25.00 5.00 P 7.1 8.6E+17 n/a 12 90 c -116.48;
33.92
-115.71;
33.35
Slip rate based on Sieh and Williams (1990); Sieh (1986); Keller et al. (1982); Bronkowski (1981). Model assumes slip only in S. San Andreas events.
San Andreas-
San Bernardino
(rl-ss)
107 11 24.00 6.00 M 7.3 1.4E+18 433 18 90 c -117.53;
34.31
-116.48;
33.92
Slip rate reported by Weldon and Sieh (1985).
San Andreas (southern)
(rl-ss)
203 20 24.00 6.00 P 7.4 1.8E+18 220 12 90 c -117.53;
34.31
-115.71;
33.35
Rupture of San Bernardino and Coachella segments. Slip rate based on Coachella segment.
San Andreas-
Mojave
(rl-ss)
99 10 30.00 7.00 P 7.1 1.1E+18 550 12 90 c -118.50;
34.70
-117.53;
34.31
Slip rate based on Sieh (1984), Salyards et al. (1992), and WGCEP (1995).
San Andreas-
Carrizo
(rl-ss)
145 15 34.00 3.00 W 7.2 1.8E+18 n/a 12 90 c -119.86;
35.31
-118.50;
34.70
Slip rate based on Sieh and Jahns (1984). Model assumes slip only in 1857-type events.
San Andreas-
Cholame
(rl-ss)
62 6 34.00 5.00 P 6.9 7.6E+17 437 12 90 c -120.29;
35.75
-119.86;
35.31
Slip rate based on analogy with Carrizo segment.
San Andreas-
Parkfield Segment
(rl-ss)
37 4 34.00 5.00 P 6.7 4.5E+17 25 12 90 c -120.56;
36.00
-120.29;
35.75
Slip rate reported by WGCEP (1995).
San Andreas (1857 rupture)
(rl-ss)
345 35 34.00 5.00 W 7.8 4.2E+18 206 12 90 c -120.56;
36.00
-117.53;
34.31
Rupture of Parkfield, Cholame, Carrizo, and Mojave segments. Max. magnitude based on 1857 event (Ellsworth, 1990). Slip rate based on Carrizo segment.
San Andreas (creeping segment)
(rl-ss)
125 13 34.00 5.00 P * 0.0E+00 n/a 12 90 c -121.59;
36.89
-120.56;
36.00
Background seismicity.
San Andreas (Pajaro)
(rl-ss)
22 2 14.00 3.00 P 6.8 1.7E+17 n/a 18 90 c -122.00;
37.18
-121.51;
36.82
Pajaro segment assumed to rupture only in 1906-type events.
San Andreas (Santa Cruz Mtn)
(rl-ss)
37 4 14.00 3.00 P 7.0 2.8E+17 400 18 90 c -122.00;
37.18
-121.69;
36.95
Slip rate based on Lienkaemper, et al. (1991) and assumption that 3 mm/yr rate transferred to Sargent fault. Max. magnitude based on 1.6 m displacement.
San Andreas (Peninsula)
(rl-ss)
88 9 17.00 3.00 M 7.1 6.3E+17 400 14 90 c -122.60;
37.81
-122.00;
37.18
Slip rate is based on Clahan, et al. (1995) and assumptions by Lienkaemper (1996). Max. magnitude based on 1.6 m displacement.
San Andreas (North Coast)
(rl-ss)
322 32 24.00 3.00 M 7.6 2.8E+18 n/a 12 90 c -124.41;
40.25
-122.59;
37.82
Assumption that North Coast segment ruptures only in 1906-type events. Slip rate based on Niemi and Hall (1992) and Prentice, et al, (1991).
San Andreas (1906)
(rl-ss)
470 47 24.00 3.00 M 7.9 4.1E+18 210 12 90 c -124.41;
40.25
-121.51;
36.82
Slip rate based on Niemi and Hall (1992) and Prentice, et al (1991). Assumption that 1906 events rupture North Coast, Pennisula, and Santa Cruz Mtns. segments to San Juan Bautista. Max. magnitude based on 1906 average 5 m displacement (WGCEP, 1990; Lienkaemper, 1996).
                            ---------------------------------------------
1. (ss) strike slip, (r) reverse, (n) normal, (rl) right lateral, (ll) left lateral, (o) oblique
2. W = well constrained slip rate; M = moderately constrained slip rate; P = poorly constrained slip rate; U = unconstrained.
3. Maximum moment magnitude calculated from rupture area regressions (type "all") from Wells and Coppersmith (1994).
4. (c) characteristic; (g) Gutenberg-Richter; (cg) 50% characteristic - 50% Gutenberg-Richter.

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Copyright © California Department of Conservation,
Division of Mines and Geology, 1996-1997. All rights reserved.
The Department of Conservation makes no warranties
as to the suitability of this product for any purpose.

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