Max Est. MMI
M4.9 earthquake · shaking intensity by town 9 km N of Delta, B.C., MX
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) |
|---|---|---|
|
Nuevo León
MX |
760 | 198 |
|
Ejido Saltillo
MX |
760 | 205 |
|
Ejido Vicente Guerrero
MX |
760 | 191 |
|
Delta
MX |
760 | 190 |
|
Ejido Quintana Roo
MX |
760 | 198 |
|
Ejido Toluca
MX |
760 | 192 |
|
Estación Pescaderos
MX |
760 | 186 |
|
Michoacán de Ocampo
MX |
760 | 187 |
|
Ejido Jiquilpan
MX |
760 | 190 |
|
Ejido Pátzcuaro
MX |
760 | 198 |
|
Ejido Sinaloa
MX |
760 | 180 |
|
Poblado Lázaro Cárdenas (La Veintiocho)
MX |
760 | 207 |
|
Guadalupe Victoria
MX |
760 | 190 |
|
Ejido Sonora
MX |
760 | 190 |
|
Islas Agrarias Grupo B
MX |
760 | 196 |
|
Puebla
MX |
760 | 200 |
|
Islas Agrarias Grupo A
MX |
760 | 189 |
|
Colonia Venustiano Carranza
MX |
760 | 190 |
|
Doctor Alberto Oviedo Mota
MX |
760 | 190 |
|
Ejido Durango
MX |
760 | 190 |
|
Ejido Yucatán
MX |
760 | 184 |
|
Tecolots
MX |
760 | 180 |
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 | -0.62 | 0.44 | 0.76 |
| BSSA14 | -0.36 | 0.36 | 0.51 |
| CY14 | -0.46 | 0.38 | 0.60 |
| CB14 | -0.64 | 0.38 | 0.74 |
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) |
|---|---|---|---|---|
| CERRO PRIETO (BC.CPX) | 0.1767 | Strong(VI) | 0.970 | Weak(III) |
| Ejido Yucatan (BC.YUC2X) | 0.0559 | Light(IV) | 1.427 | Light(IV) |
| Guadalupe Victoria (BC.GUVIX) | 0.0489 | Light(IV) | 2.572 | Light(IV) |
| Bonds Corner, Omlin Residence (NP.5054) | 0.0405 | Light(IV) | 1.939 | Light(IV) |
| Ejido Aguascalientes (BC.AGSX) | 0.0376 | Light(IV) | 2.899 | Light(IV) |
| Schaffner Ranch (CI.SNR) | 0.0277 | Light(IV) | 1.807 | Light(IV) |
| El Centro Array 11, McCabe School (NP.5058) | 0.0256 | Light(IV) | 0.998 | Weak(III) |
| Desert Research Extended Center (CI.DRE) | 0.0232 | Weak(III) | 2.248 | Light(IV) |
| UABC Campus Mexicali (BC.UABX) | 0.0191 | Weak(III) | 0.982 | Weak(III) |
| East Mesa (CI.EMS) | 0.0177 | Weak(III) | 0.433 | Weak(III) |
| El Centro (CI.ELO) | 0.0161 | Weak(III) | 0.807 | Weak(III) |
| Fire Station (NP.5053) | 0.0112 | Weak(III) | 0.680 | Weak(III) |
| Midway Well (NP.5272) | 0.0095 | Weak(III) | 0.304 | Weak(III) |
| American Girl Mine (CI.AGM) | 0.0092 | Weak(III) | 0.252 | Weak(II) |
| Imperial (CI.IMP) | 0.0091 | Weak(III) | 0.562 | Weak(III) |
| El Centro Array 1, Borchard Ranches (NP.5056) | 0.0087 | Weak(III) | 0.777 | Weak(III) |
| Coachella (CI.COA) | 0.0086 | Weak(III) | 0.561 | Weak(III) |
| Ocotillo Community Park (CI.OCP) | 0.0077 | Weak(III) | 0.256 | Weak(II) |
| Cook Ranch 2 (CI.COK2) | 0.0071 | Weak(III) | 0.308 | Weak(III) |
| Bombay Beach (CI.BOM) | 0.0062 | Weak(III) | 0.164 | Weak(II) |
| Signal Mtn (CI.SGL) | 0.0045 | Weak(II) | 0.246 | Weak(II) |
| Ruthven (CI.RUN) | 0.0044 | Weak(II) | 0.254 | Weak(II) |
| Camino Del Diablo (CI.CDD) | 0.0037 | Weak(II) | 0.064 | Weak(II) |
| Rancho Alamar- (BC.ALAMX) | 0.0028 | Weak(II) | 0.193 | Weak(II) |
| Calipatria 2 (CI.CLI2) | 0.0027 | Weak(II) | 0.247 | Weak(II) |
Ground Shaking Intensities — Interpolated ShakeMap MMI
22 sitesSeismic Station Observed MMI
MMI values are derived directly from observed ground motion measurements at seismic stations and are not spatially interpolated.