Intensity Lab
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II

Max Est. MMI

77 km NE of Tonopah, Nevada

Magnitude4.5
Depth7.0 km
Time 2026-05-05T02:39:52.449000Z UTC: 2026-05-05T02:39:52.449000Z
USGS ID nn00917635
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Ground Shaking Intensities — Interpolated ShakeMap MMI

3 sites
Location MMI
Tonopah
NV 		II
Goldfield
NV 		II
Eureka
NV 		II

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
Troy Canyon, Currant, NV, USA (NN.R11B) I
Outlaw Springs Mine, Nye County, NV, USA (NN.OUT1) I
Black Rock Springs, NV, USA (NN.BRS2) 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).

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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)
Tonopah
NV 		760 544
Goldfield
NV 		760 433
Eureka
NV 		760 563

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 +0.10 0.28 0.29
BSSA14 +0.10 0.28 0.29
CY14 +0.10 0.28 0.29
CB14 +0.10 0.28 0.29
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)
Black Rock Springs, NV, USA (NN.BRS2) 0.0014 I 0.045 II
Rachel, NV, USA - NN reactivation (NN.S11A) 0.0013 I 0.077 II
Outlaw Springs Mine, Nye County, NV, USA (NN.OUT1) 0.0009 I 0.024 I
Warrior Mine, Nye County, NV, USA (NN.WAR3) 0.0005 I 0.019 I
Troy Canyon, Currant, NV, USA (NN.R11B) 0.0005 I 0.010 I
Chalk Mountain, Churchill County, NV, USA (NN.CMK6) 0.0005 I 0.020 I
Fire Station (NP.1679) 0.0005 I 0.020 I
Kaiserville, Nevada w84gm (NN.KVN) 0.0004 I 0.017 I
UCLA Research Station (NP.1589) 0.0003 I 0.020 I
TV Hill 1, Hawthorne, NV (NN.TVH1) 0.0003 I 0.024 I
Lincoln Peak (NC.MLI) 0.0003 I 0.013 I
Doe Ridge #3 (NC.MDR) 0.0003 I 0.010 I
Tinemaha (CI.TIN) 0.0002 I 0.016 I
Five Bridges (NC.MFBB) 0.0002 I 0.015 I
Bald Mountain (NC.MBM) 0.0002 I 0.018 I
Casa Benchmark (NC.MCB) 0.0002 I 0.013 I
East Mammoth (NC.MEM) 0.0002 I 0.011 I
Mammoth Hole surface (NC.MDH) 0.0001 I 0.008 I
Dry Creek (NC.MDY) 0.0001 I 0.013 I
Lookout Mountain (NC.MLMB) 0.0001 I 0.011 I
Convict Moraine #3 (NC.MCO) 0.0001 I 0.007 I
Mammoth Mtn McCoy #2 (NC.MCY) 0.0001 I 0.004 I
Darwin (CI.DAW) 0.0001 I 0.003 I
Rademacher Property, Miramonte, CA, USA (BK.HELL) 0.0001 I 0.001 I
Sheep Range, Nevada w84gm (NN.SHP) 0.0000 I 0.003 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.