Max Est. MMI
31 km SW of Dana Point, CA
Engineering Ground Motion Parameters
GMPE predictions provide an independent check on the ShakeMap interpolated intensities above.
ShakeMap relies on seismic station recordings; in areas with sparse station coverage — or
for large teleseismic events and earthquakes outside dense West Coast networks — ShakeMap
MMI can be inaccurate. A significant difference between ShakeMap and GMPE estimates is a signal
that the ShakeMap result should be treated as preliminary.
Also includes site Vs30 values and raw ground motion parameters (PGA/PGV).
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Engineering Ground Motion Parameters
GMPE predictions provide an independent check on the ShakeMap interpolated intensities above. ShakeMap relies on seismic station recordings; in areas with sparse station coverage — or for large teleseismic events and earthquakes outside dense West Coast networks — ShakeMap MMI can be inaccurate. A significant difference between ShakeMap and GMPE estimates is a signal that the ShakeMap result should be treated as preliminary. Also includes site Vs30 values and raw ground motion parameters (PGA/PGV).
Est. Vs30 Values
Estimated shear-wave velocity in the upper 30 m used in GMPE calculations. Ref. column shows the 760 m/s rock-site reference for comparison.
| Location | Ref. (760 m/s) | Est. Vs30 (m/s) |
|---|---|---|
|
Dana Point
CA |
760 | 403 |
|
Laguna Beach
CA |
760 | 352 |
|
San Clemente
CA |
760 | 410 |
MMI vs Distance — Default Vs30 (760 m/s)
All methods using the 760 m/s rock-site reference. ShakeMap values are independent of Vs30.
MMI vs Distance — Est. Vs30
GMPEs use the Est. Vs30 values shown in the table above. ShakeMap values are independent of Vs30.
GMPE Residual — Observed − Predicted MMI
Signed residual at each seismic station. Positive values mean the GMPE underestimated shaking; negative values mean it overestimated. The dashed line at zero indicates perfect agreement.
GMPE Predicted vs. Observed MMI at Seismic Stations
Each point is one seismic station. Points on the dashed 1:1 line indicate perfect agreement; above the line = GMPE underestimated shaking; below = overestimated.
GMPE Performance — Station Observations
Statistics computed by comparing each GMPE's predicted MMI against ShakeMap observed MMI at seismic stations. Bias = mean(observed − predicted). Lower RMSE indicates better overall agreement with instrumental measurements.
| GMPE | Bias | Sigma | RMSE |
|---|---|---|---|
| ASK14 | +0.07 | 0.21 | 0.22 |
| BSSA14 | +0.07 | 0.21 | 0.22 |
| CY14 | +0.07 | 0.21 | 0.22 |
| CB14 | +0.07 | 0.21 | 0.22 |
Peak Ground Motion — Seismic Station Observations
Recorded PGA and PGV at seismic stations, sorted by highest PGA. Top 25 stations shown. MMI (PGA) and MMI (PGV) are independent conversions via Worden et al. (2012) GMICE.
| Station | PGA (g) | MMI (PGA) | PGV (cm/s) | MMI (PGV) |
|---|---|---|---|---|
| Pacific Marine Mammal Center (CI.MMC) | 0.0024 | Not felt(I) | 0.079 | Weak(II) |
| Rawhide Ranch (CI.RHR) | 0.0023 | Not felt(I) | 0.043 | Not felt(I) |
| Santee (CE.02143) | 0.0018 | Not felt(I) | 0.050 | Not felt(I) |
| Dos Picos County Park (CI.DPP) | 0.0015 | Not felt(I) | 0.035 | Not felt(I) |
| Dulzura (CI.DZA) | 0.0014 | Not felt(I) | 0.028 | Not felt(I) |
| San Juan Capistrano (CE.13070) | 0.0014 | Not felt(I) | 0.059 | Weak(II) |
| Idyllwild (CI.IDY) | 0.0013 | Not felt(I) | 0.032 | Not felt(I) |
| Poway (CE.03260) | 0.0012 | Not felt(I) | 0.025 | Not felt(I) |
| Camp Pendleton 2 (CI.CPT2) | 0.0012 | Not felt(I) | 0.043 | Not felt(I) |
| Neenach (CI.NEN) | 0.0012 | Not felt(I) | 0.010 | Not felt(I) |
| San Diego (CE.03145) | 0.0011 | Not felt(I) | 0.048 | Not felt(I) |
| Lusardi Creek County Preserve (CI.LUS) | 0.0011 | Not felt(I) | 0.028 | Not felt(I) |
| Isla Coronado (BC.CORX) | 0.0011 | Not felt(I) | 0.024 | Not felt(I) |
| Camp Elliot (CI.CPE) | 0.0010 | Not felt(I) | 0.035 | Not felt(I) |
| San Diego Road Dept (CI.SDR) | 0.0010 | Not felt(I) | 0.020 | Not felt(I) |
| Valley Center-Pauma Unified School District (CI.VCP) | 0.0010 | Not felt(I) | 0.011 | Not felt(I) |
| Mira Catalina School (CI.MIS) | 0.0010 | Not felt(I) | 0.027 | Not felt(I) |
| Mt. San Jacinto Campus (CI.MSJ) | 0.0009 | Not felt(I) | 0.033 | Not felt(I) |
| Fire Station (NP.5491) | 0.0009 | Not felt(I) | 0.026 | Not felt(I) |
| San Onofre Canyon (CI.SOC) | 0.0009 | Not felt(I) | 0.044 | Not felt(I) |
| Channel Island (CI.CHI) | 0.0009 | Not felt(I) | 0.010 | Not felt(I) |
| San Diego (CE.03468) | 0.0009 | Not felt(I) | 0.041 | Not felt(I) |
| Otay Lakes Park (CI.OLP) | 0.0008 | Not felt(I) | 0.018 | Not felt(I) |
| La Jolla (CE.03738) | 0.0008 | Not felt(I) | 0.018 | Not felt(I) |
| Pala (CI.PALA) | 0.0008 | Not felt(I) | 0.020 | Not felt(I) |
Ground Shaking Intensities — Interpolated ShakeMap MMI
3 sites| Location | MMI Description |
|---|---|
|
Dana Point
CA |
Weak(II) |
|
Laguna Beach
CA |
Not felt(I) |
|
San Clemente
CA |
Not felt(I) |
Seismic Station Observed MMI
MMI values are derived directly from observed ground motion measurements at seismic stations and are not spatially interpolated.
| Station | MMI Description |
|---|---|
| San Juan Capistrano (CE.13070) | Weak(II) |
| San Onofre Canyon (CI.SOC) | Not felt(I) |
| Kerckhoff Marine Laboratory (CI.KML) | Not felt(I) |