Intensity Lab
← All events
III

Max Est. MMI

20 km SE of Silver Springs, Nevada

Magnitude4.1
Depth10.8 km
Time 2026-05-01T08:15:55.842000Z UTC: 2026-05-01T08:15:55.842000Z
USGS ID nn00916977
ShakeMap View USGS ↗

Ground Shaking Intensities — Interpolated ShakeMap MMI

3 sites
Location MMI
Silver Springs
NV 		III
Fallon
NV 		III
Stagecoach
NV 		III

Seismic Station Observed MMI

MMI values are derived directly from observed ground motion measurements at seismic stations and are not spatially interpolated.

3 stations
Station MMI
Yerington, Nevada w84gm (NN.YER) II
Pah Rah Range, Nevada w84gm (NN.PAH) II
Redfield Campus, S. Reno, Nevada (NN.REDF) II

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).

Show ▼

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)
Silver Springs
NV 		760 322
Fallon
NV 		760 201
Stagecoach
NV 		760 370

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 — default Vs30

MMI vs Distance — Est. Vs30

GMPEs use the Est. Vs30 values shown in the table above. ShakeMap values are independent of Vs30.

MMI vs distance — Est. 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 residual plot

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 predicted vs observed scatter

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 +0.08 0.24 0.25
BSSA14 +0.08 0.24 0.25
CY14 +0.08 0.24 0.25
CB14 +0.08 0.24 0.25
Bias > 0: GMPE underestimated shaking at stations. Bias < 0: GMPE overestimated shaking.

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)
Buffalo Canyon, Nevada w84gm (NN.BFC) 0.0021 I 0.081 II
Yerington, Nevada w84gm (NN.YER) 0.0020 I 0.073 II
Pah Rah Range, Nevada w84gm (NN.PAH) 0.0012 I 0.034 II
Redfield Campus, S. Reno, Nevada (NN.REDF) 0.0007 I 0.029 II
Bunker Hill, Placer County, CA (NN.BUNK) 0.0007 I 0.011 I
Thunderbird Lodge, Lake Tahoe, NV (NN.TBRD) 0.0007 I 0.015 I
Kaiserville, Nevada w84gm (NN.KVN) 0.0007 I 0.022 I
Winnemucca Valley, Nevada w84 (NN.WVA) 0.0006 I 0.026 I
Bishop Manogue Catholic High School, Reno, NV (NN.BMHS) 0.0006 I 0.027 II
Weber Reservoir, near Camino (BK.WEBR) 0.0006 I 0.011 I
Highway Maintenance Yard (NP.2021) 0.0006 I 0.019 I
Bald Mtn, NV (NN.BALD) 0.0006 I 0.025 I
Washoe Valley, Nevada;Laurence Kaplan Property (NN.WASH) 0.0006 I 0.011 I
Zephyr Cove, Lake Tahoe, Nevada (NN.ZPR) 0.0006 I 0.015 I
Queen Bee, Mono County, California (NN.QNBC) 0.0006 I 0.016 I
Black Rock Springs, NV, USA (NN.BRS2) 0.0006 I 0.023 I
Pyramid Lake 2 (NN.PYM2) 0.0005 I 0.017 I
Big Hill, ElDorado County, CA (NN.BIGH) 0.0005 I 0.010 I
TV Hill 1, Hawthorne, NV (NN.TVH1) 0.0004 I 0.026 II
Minden/Gardnerville Fire Stn RT130-ANSS w84gm (NN.MND1) 0.0004 I 0.016 I
Weller Cave, Western Cave Conservancy, Sutter Creek, CA (BK.WELL) 0.0004 I 0.012 I
Sierra Vista (NC.MSVB) 0.0004 I 0.010 I
Chalk Mountain, Churchill County, NV, USA (NN.CMK6) 0.0004 I 0.013 I
Loyalton, CA digital upgrade (NN.LOYB) 0.0004 I 0.010 I
Lower Ebbet's Pass, California (NN.EBPB) 0.0004 I 0.013 I
Source: USGS ShakeMap station recordings (view ShakeMap). PGA in g (fraction of gravitational acceleration); PGV in cm/s. The observed MMI shown on the map uses ShakeMap's reported instrumental intensity where available, or max(MMI from PGA, MMI from PGV) otherwise.