Max Est. MMI
The 2014 South Napa, California Earthquake
Shaking Animations
Simulated bowling pin shaking at each city’s intensity level. Videos appear as they finish rendering. The ground motion behind each video is under Ground Motion Records.
| Location | Type | Intensity at site | Animation | Ground motion |
|---|---|---|---|---|
| Huichica Creek NCSN Data: Acceleration | Station · Tabletop Observed | Severe(VIII) station record | Download Produced 2026-08-04T17:32:14.564263Z | |
| Decay: San Jose direction | Decay · Tabletop Simulated | Very Strong(VII) USGS ShakeMap, 5 km site | Download Produced 2026-10-03T00:59:04.046211Z |
Data files
|
| American Canyon | City · Tabletop Simulated | Very Strong(VII) USGS ShakeMap | Download Produced 2026-10-03T04:52:39.740314Z |
Data files
|
Ground Motion Records
The shaking each animation was drawn from: acceleration, velocity and displacement in three directions. The shaded band marks the part the animation shows.
City · Simulated — American Canyon, CA
Used by the Tabletop videoA physics-based simulation of this earthquake (SCEC Broadband Platform) at this site: one realization, not an average.
| Site | PGA (g) | PGV (cm/s) | PGD (cm) | Data files |
|---|---|---|---|---|
| American Canyon, CA | 0.3948 | 18.55 | 4.40 | Acceleration · Velocity · Displacement |
Peak values are horizontal (the larger of north–south and east–west) over the whole record. Time zero: rupture origin time (simulation time 0).
Decay · Simulated — 5 km from the epicenter, 50 km from the epicenter, 100 km from the epicenter
Used by the Tabletop videoA physics-based simulation of this earthquake (SCEC Broadband Platform) at this site: one realization, not an average.
| Site | PGA (g) | PGV (cm/s) | PGD (cm) | Data files |
|---|---|---|---|---|
| 5 km from the epicenter | 0.3709 | 18.23 | 3.18 | Acceleration · Velocity · Displacement |
| 50 km from the epicenter | 0.0584 | 5.33 | 1.48 | Acceleration · Velocity · Displacement |
| 100 km from the epicenter | 0.0271 | 3.10 | 1.11 | Acceleration · Velocity · Displacement |
Peak values are horizontal (the larger of north–south and east–west) over the whole record. Time zero: rupture origin time (simulation time 0).
About these files
Each file is plain text in the SCEC Broadband Platform layout. Lines starting with # are a header describing the earthquake, the site, where the motion came from, how it was processed, its peak values, and which part the animation shows. Then come four columns: time (s), north–south, east–west, and up–down. North–south comes before east–west.
Units: acceleration in cm/s², velocity in cm/s, displacement in cm. The zip also contains the plots and a README.
To read a file in Python: t, ns, ew, ud = numpy.loadtxt("file.acc.bbp", comments="#", unpack=True). A spreadsheet can open it as whitespace-delimited text.
These records explain what the animations show. A single simulation, one station’s record, or a synthetic scaled to one value is not an engineering estimate of ground motion at a site.
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) |
|---|---|---|
|
Napa
CA |
760 | 294 |
|
American Canyon
CA |
760 | 474 |
|
Yountville
CA |
760 | 338 |
|
Sonoma
CA |
760 | 397 |
|
Agua Caliente
CA |
760 | 410 |
|
Vallejo
CA |
760 | 503 |
|
Fetters Hot Springs-Agua Caliente
CA |
760 | 441 |
|
El Verano
CA |
760 | 294 |
|
Boyes Hot Springs
CA |
760 | 461 |
|
Eldridge
CA |
760 | 352 |
|
Temelec
CA |
760 | 386 |
|
Saint Helena
CA |
760 | 294 |
|
Crockett
CA |
760 | 503 |
|
Rodeo
CA |
760 | 324 |
|
Kenwood
CA |
760 | 294 |
|
Benicia
CA |
760 | 176 |
|
Martinez
CA |
760 | 314 |
|
Green Valley
CA |
760 | 345 |
|
Suisun
CA |
760 | 226 |
|
Angwin
CA |
760 | 519 |
|
Hercules
CA |
760 | 465 |
|
Deer Park
CA |
760 | 519 |
|
Santa Rosa
CA |
760 | 294 |
|
Mountain View
CA |
760 | 422 |
|
Rohnert Park
CA |
760 | 228 |
|
Pinole
CA |
760 | 382 |
|
El Sobrante
CA |
760 | 425 |
|
Tara Hills
CA |
760 | 466 |
|
Fairfield
CA |
760 | 228 |
|
Middletown
CA |
760 | 294 |
|
Bayview
CA |
760 | 358 |
|
Montalvin
CA |
760 | 466 |
|
Pacheco
CA |
760 | 410 |
|
Roseland
CA |
760 | 257 |
|
Black Point-Green Point
CA |
760 | 180 |
|
Larkfield-Wikiup
CA |
760 | 474 |
|
North Richmond
CA |
760 | 225 |
|
Petaluma
CA |
760 | 294 |
|
Calistoga
CA |
760 | 294 |
|
Novato
CA |
760 | 331 |
|
Penngrove
CA |
760 | 395 |
|
Cotati
CA |
760 | 373 |
|
Contra Costa Centre
CA |
760 | 294 |
|
Hartley
CA |
760 | 468 |
|
Vine Hill
CA |
760 | 366 |
|
San Pablo
CA |
760 | 289 |
|
Waldon
CA |
760 | 294 |
|
Allendale
CA |
760 | 228 |
|
Hidden Valley Lake
CA |
760 | 710 |
|
Pittsburg
CA |
760 | 359 |
|
Pleasant Hill
CA |
760 | 236 |
|
Rollingwood
CA |
760 | 319 |
|
Walnut Creek
CA |
760 | 399 |
|
Sebastopol
CA |
760 | 468 |
|
Healdsburg
CA |
760 | 352 |
|
Esparto
CA |
760 | 351 |
|
Lower Lake
CA |
760 | 423 |
|
Blackhawk
CA |
760 | 466 |
|
Clearlake
CA |
760 | 463 |
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 | -0.17 | 0.90 | 0.92 |
| BSSA14 | -0.31 | 0.83 | 0.89 |
| CY14 | -0.05 | 0.81 | 0.81 |
| CB14 | -0.22 | 0.83 | 0.86 |
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) |
|---|---|---|---|---|
| Main St Napa (NC.N016) | 0.6468 | Strong(VI) | 34.416 | Violent(IX) |
| CA:Napa;Main Street (--.N016) | 0.6186 | Strong(VI) | 48.118 | Violent(IX) |
| Vallejo - Broadway & Sereno CGS Data: Acceleration (--.68294) | 0.4685 | Strong(VI) | 17.735 | Severe(VIII) |
| Vallejo - Broadway & Sereno (CE.68294) | 0.4660 | Strong(VI) | 17.396 | Severe(VIII) |
| CA:Napa;FS 3 (NP.1765) | 0.4507 | Strong(VI) | 86.866 | Extreme(X) |
| CA:Napa;FS 3 (US.1765) | 0.4266 | Strong(VI) | 91.050 | Extreme(X) |
| Crockett - Carquinez Br Geotech Array #2 (CE.68259) | 0.4240 | Strong(VI) | 19.779 | Severe(VIII) |
| Huichica Creek (NC.NHC) | 0.4029 | Strong(VI) | 59.781 | Violent(IX) |
| Mare Island (NC.NMI) | 0.3774 | Strong(VI) | 19.025 | Severe(VIII) |
| Napa - Napa College CGS Data: Acceleration (--.68150) | 0.3753 | Strong(VI) | 56.900 | Violent(IX) |
| MARE ISLAND METERS FAC+EEP/v3. (US.NMI) | 0.3683 | Strong(VI) | 19.086 | Severe(VIII) |
| Napa - Napa College (CE.68150) | 0.3580 | Strong(VI) | 54.768 | Violent(IX) |
| Vallejo Fire Station 21 (NP.1759) | 0.3455 | Strong(VI) | 17.074 | Severe(VIII) |
| Kruezer Lane (YK.KRE) | 0.3408 | Strong(VI) | 25.908 | Severe(VIII) |
| CA:Vallejo;FS 1 (US.1759) | 0.3294 | Strong(VI) | 21.238 | Severe(VIII) |
| Lovall Valley Loop Rd (NC.N019B) | 0.2766 | Moderate(V) | 37.367 | Violent(IX) |
| Pinole (CE.58368) | 0.2029 | Moderate(V) | 12.112 | Very Strong(VII) |
| Pinole - Adobe & Pinole Valley Rd CGS Data: Acceleration (--.58368) | 0.2027 | Moderate(V) | 11.926 | Very Strong(VII) |
| CA:Anderson Springs (NP.ADSP) | 0.1743 | Moderate(V) | 1.826 | Moderate(V) |
| CA:Anderson Springs (US.ADSP) | 0.1736 | Moderate(V) | 2.578 | Moderate(V) |
| CA:Anderson Springs;Town Pool (NP.ADS2) | 0.1612 | Moderate(V) | 1.477 | Moderate(V) |
| CA:Anderson Springs;Town Pool (US.ADS2) | 0.1593 | Moderate(V) | 1.857 | Moderate(V) |
| CA:Arnold;Glen Ellen FS (US.1848) | 0.1527 | Moderate(V) | 9.907 | Very Strong(VII) |
| CA:Santa Rosa; FS7 (US.1835) | 0.1521 | Moderate(V) | 7.395 | Very Strong(VII) |
| Sonoma FS 1 (NP.1829) | 0.1427 | Moderate(V) | 24.930 | Severe(VIII) |
Ground Shaking Intensities — Interpolated ShakeMap MMI
59 sitesSeismic Station Observed MMI
MMI values are derived directly from observed ground motion measurements at seismic stations and are not spatially interpolated.