Max Est. MMI
10 km NNE of Kettleman City, 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) |
|---|---|---|
|
Kettleman City
CA |
760 | 385 |
|
Stratford
CA |
760 | 228 |
|
Lemoore Station
CA |
760 | 228 |
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 | +0.04 | 0.17 | 0.17 |
| BSSA14 | +0.04 | 0.17 | 0.18 |
| CY14 | +0.04 | 0.17 | 0.17 |
| CB14 | +0.04 | 0.16 | 0.17 |
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) |
|---|---|---|---|---|
| Las Perillas Free Field (WR.LPFF) | 0.0023 | Not felt(I) | 0.047 | Not felt(I) |
| Porterville (CI.POR) | 0.0020 | Not felt(I) | 0.022 | Not felt(I) |
| Avenal State Prison (BK.AVSP) | 0.0018 | Not felt(I) | 0.073 | Weak(II) |
| Crazy Canyon #3 (NC.PCC) | 0.0012 | Not felt(I) | 0.055 | Not felt(I) |
| Los Alamos County Park (CI.LCP) | 0.0008 | Not felt(I) | 0.009 | Not felt(I) |
| Kettleman Hills (BK.KETL) | 0.0008 | Not felt(I) | 0.051 | Not felt(I) |
| Pleasant Valley (BK.PVSP) | 0.0008 | Not felt(I) | 0.036 | Not felt(I) |
| Corcoran (BK.CCOR) | 0.0007 | Not felt(I) | 0.026 | Not felt(I) |
| Black Orchard (NC.PBO) | 0.0007 | Not felt(I) | 0.029 | Not felt(I) |
| West Hills College (BK.WHCL) | 0.0007 | Not felt(I) | 0.033 | Not felt(I) |
| South End of Cholame Valley, Shandon, CA, USA (BK.THIS) | 0.0006 | Not felt(I) | 0.032 | Not felt(I) |
| Jacalitos Hills (NC.PJC) | 0.0006 | Not felt(I) | 0.027 | Not felt(I) |
| Bear Mountain (NC.MBEB) | 0.0006 | Not felt(I) | 0.018 | Not felt(I) |
| Lindcove REC, Exeter, CA (BK.LIND) | 0.0005 | Not felt(I) | 0.007 | Not felt(I) |
| Domigine Ranch #3 (NC.PDRB) | 0.0005 | Not felt(I) | 0.018 | Not felt(I) |
| Fire Station (NP.1747) | 0.0005 | Not felt(I) | 0.017 | Not felt(I) |
| Carr Hill seismic site #4 (NC.PCHD) | 0.0004 | Not felt(I) | 0.020 | Not felt(I) |
| Le Cuvier Winery, Paso Robles, CA (BK.LCUV) | 0.0004 | Not felt(I) | 0.014 | Not felt(I) |
| Petersen Ranch, Tollhouse, CA (BK.TOLH) | 0.0004 | Not felt(I) | 0.009 | Not felt(I) |
| Lincoln Peak (NC.MLI) | 0.0004 | Not felt(I) | 0.013 | Not felt(I) |
| Vestal (CI.VES) | 0.0004 | Not felt(I) | 0.017 | Not felt(I) |
| Patterson Mtn (BK.PATT) | 0.0004 | Not felt(I) | 0.013 | Not felt(I) |
| Hog Canyon Seismic Site #3 (NC.PHOC) | 0.0004 | Not felt(I) | 0.018 | Not felt(I) |
| Bitterwater Ranch (BK.BITR) | 0.0004 | Not felt(I) | 0.015 | Not felt(I) |
| Springville 2 (CI.SPG2) | 0.0004 | Not felt(I) | 0.008 | Not felt(I) |
Ground Shaking Intensities — Interpolated ShakeMap MMI
3 sites| Location | MMI Description |
|---|---|
|
Kettleman City
CA |
Weak(III) |
|
Stratford
CA |
Weak(II) |
|
Lemoore Station
CA |
Weak(II) |
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 |
|---|---|
| Kettleman Hills (BK.KETL) | Weak(II) |
| Avenal State Prison (BK.AVSP) | Weak(II) |
| West Hills College (BK.WHCL) | Not felt(I) |