Max Est. MMI
M3.8 earthquake · shaking intensity by town 21 km WSW of Gerlach, Nevada
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) |
|---|---|---|
|
Janesville
CA |
760 | 435 |
|
Johnstonville
CA |
760 | 230 |
|
Susanville
CA |
760 | 301 |
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 | +0.02 | 0.16 | 0.16 |
| BSSA14 | +0.01 | 0.17 | 0.17 |
| CY14 | +0.02 | 0.16 | 0.16 |
| CB14 | +0.01 | 0.16 | 0.16 |
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) |
|---|---|---|---|---|
| Manzanita Lookout (BK.MZTA) | 0.0012 | Not felt(I) | — | — |
| Pyramid Lake 2 (NN.PYM2) | 0.0011 | Not felt(I) | 0.027 | Not felt(I) |
| Shaffer Mountain (WR.SFM) | 0.0005 | Not felt(I) | 0.018 | Not felt(I) |
| Red Shale Butte 2 (NC.LRSB) | 0.0004 | Not felt(I) | — | — |
| Ravendale, CA (BK.RAVE) | 0.0004 | Not felt(I) | 0.016 | Not felt(I) |
| Diaz Spring, Lassen County (BK.DIAZ) | 0.0003 | Not felt(I) | 0.012 | Not felt(I) |
| Fox Mountain, NV (NN.FOX) | 0.0003 | Not felt(I) | 0.026 | Not felt(I) |
| Little Valley, Lassen County (BK.LITV) | 0.0003 | Not felt(I) | 0.014 | Not felt(I) |
| Swain Mt (BK.SWNM) | 0.0003 | Not felt(I) | 0.012 | Not felt(I) |
| Verdi Peak, California (NN.VPK) | 0.0003 | Not felt(I) | 0.018 | Not felt(I) |
| Dry Creek Basin Area (BK.DRYC) | 0.0003 | Not felt(I) | 0.007 | Not felt(I) |
| Happy Camp Mountain (BK.HAPY) | 0.0003 | Not felt(I) | 0.010 | Not felt(I) |
| Washoe County DEM, Nevada (NN.WDEM) | 0.0002 | Not felt(I) | 0.015 | Not felt(I) |
| West Prospect Peak (NC.LWPB) | 0.0002 | Not felt(I) | 0.014 | Not felt(I) |
| Crater Lake (NC.LCL) | 0.0002 | Not felt(I) | 0.011 | Not felt(I) |
| Eagle Lake, Susanville, CA USA (BK.EAGL) | 0.0002 | Not felt(I) | 0.012 | Not felt(I) |
| Sage Hen site 5, Independence Lake, CA (NN.SAG5) | 0.0002 | Not felt(I) | 0.010 | Not felt(I) |
| Beckwourth Peak (WR.BKW) | 0.0002 | Not felt(I) | 0.008 | Not felt(I) |
| Beckworth, California w84 (NN.BEK) | 0.0002 | Not felt(I) | 0.006 | Not felt(I) |
| Pah Rah Range, Nevada w84gm (NN.PAH) | 0.0002 | Not felt(I) | 0.006 | Not felt(I) |
| Lake Britton (BK.BRIT) | 0.0002 | Not felt(I) | 0.007 | Not felt(I) |
| Baker Forest (BK.BKFS) | 0.0002 | Not felt(I) | 0.006 | Not felt(I) |
| Redfield Campus, S. Reno, Nevada (NN.REDF) | 0.0001 | Not felt(I) | 0.005 | Not felt(I) |
| Loyalton, CA digital upgrade (NN.LOYB) | 0.0001 | Not felt(I) | 0.007 | Not felt(I) |
| Moonlight Peak (BK.MNLT) | 0.0001 | Not felt(I) | 0.003 | Not felt(I) |
Ground Shaking Intensities — Interpolated ShakeMap MMI
3 sites| Location | MMI Description |
|---|---|
|
Janesville
CA |
Not felt(I) |
|
Johnstonville
CA |
Not felt(I) |
|
Susanville
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 |
|---|---|
| Pyramid Lake 2 (NN.PYM2) | Not felt(I) |
| Fox Mountain, NV (NN.FOX) | Not felt(I) |
| Ravendale, CA (BK.RAVE) | Not felt(I) |