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Chiou and Youngs PEER-NGA Empirical Ground Motion Model for ...

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Rupture Depth, Strike, Dip, <strong>and</strong> Rake: The <strong>PEER</strong>-<strong>NGA</strong> database contains 41 earthquakes<br />

with missing parameters defining the characteristics of the earthquake rupture. These<br />

earthquakes are listed in Table 3 along with estimated values <strong>for</strong> the missing parameters.<br />

The missing values were estimated from other associated events such as the main shock or<br />

other aftershocks, or from the tectonic environment. For those earthquakes unassociated with<br />

other events, fault dips were assigned based on known or inferred mechanisms as follows,<br />

90º <strong>for</strong> strike-slip, 40º <strong>for</strong> reverse (based on average value reported by Sibson <strong>and</strong> Xie, 1998),<br />

<strong>and</strong> 55º <strong>for</strong> normal (generic value <strong>for</strong> normal faults <strong>and</strong> close to the average of 54º <strong>for</strong> the<br />

normal mechanisms with known dips in the <strong>PEER</strong>-<strong>NGA</strong> data base). Where fault strike could<br />

not be inferred, it was assumed to be r<strong>and</strong>om. The comments in Table 3 indicated the basis<br />

<strong>for</strong> each estimate.<br />

EQID Earthquake M<br />

Table 3: Inferred Mechanisms, Hypocenter Depths <strong>and</strong> Fault Dips<br />

Inferred<br />

Mechanism 1,2<br />

Inferred<br />

Depth 1<br />

Inferred<br />

Strike 1<br />

Inferred<br />

Dip 1<br />

Comments<br />

0002<br />

Helena,<br />

Montana-02<br />

6 SS 6 268 75<br />

Values assumed equal to event<br />

0001<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

0003 Humbolt Bay 5.8 SS 10 R<strong>and</strong>om 90 depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0004<br />

Imperial<br />

Valley-01<br />

5 SS 90<br />

Strike-slip assumed <strong>for</strong> Imperial<br />

Valley earthquakes<br />

0005<br />

Northwest<br />

Calif-01<br />

5.5 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0007<br />

Northwest<br />

Calif-02<br />

6.6 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0008<br />

Northern<br />

Calif-01<br />

6.4 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0009 Borrego 6.5 8 R<strong>and</strong>om Assumed similar to event 0028<br />

0010<br />

Imperial<br />

Valley-03<br />

5.6 9.5<br />

Average depth of other Imperial<br />

Valley earthquakes<br />

0011<br />

Northwest<br />

Calif-03<br />

5.8 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0013<br />

Northern<br />

Calif-02<br />

5.2 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0014<br />

Southern<br />

Cali<strong>for</strong>nia<br />

6 SS 10 R<strong>and</strong>om 90 Assumed similar to event 25<br />

0015<br />

Imperial<br />

Valley-04<br />

5.5 SS 9.5 R<strong>and</strong>om 90<br />

Strike-slip assumed <strong>for</strong> Imperial<br />

Valley earthquakes, depth average<br />

of similar events<br />

Assumed SS similar to other<br />

0016<br />

Central Calif-<br />

01<br />

5.3 SS 7.4 R<strong>and</strong>om 90<br />

Hollister earthquakes <strong>and</strong> depth<br />

taken as average of values <strong>for</strong><br />

events 0034 <strong>and</strong> 0098<br />

0017<br />

Northern<br />

Calif-03<br />

6.5 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0018<br />

Imperial<br />

Valley-05<br />

5.4 SS 9.5 R<strong>and</strong>om 90<br />

Strike-slip assumed <strong>for</strong> Imperial<br />

Valley earthquakes, depth average<br />

of similar events<br />

Assumed SS similar to other<br />

0021<br />

Central Calif-<br />

02<br />

5 SS 7.4 R<strong>and</strong>om 90<br />

Hollister earthquakes <strong>and</strong> depth<br />

taken as average of values <strong>for</strong><br />

events 0034 <strong>and</strong> 0098<br />

0022<br />

Northern<br />

Calif-04<br />

5.7 SS 10 R<strong>and</strong>om 90<br />

Strike-slip mechanism <strong>and</strong> nominal<br />

depth of 10 km assumed <strong>for</strong><br />

offshore Gorda plate earthquakes<br />

0023 Hollister-01 5.6 SS 7.4 R<strong>and</strong>om 90<br />

Assumed SS similar to other<br />

Hollister earthquakes <strong>and</strong> depth<br />

C&Y2006 Page 7

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