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Intensity Lab
IV

Max Est. MMI

M4.8 earthquake · shaking intensity by town 19 km SE of Silver Springs, Nevada

Magnitude4.8
Depth3.0 km
Time 2026-04-22T17:23:37.085000Z UTC: 2026-04-22T17:23:37.085000Z
USGS ID nn00916046
ShakeMap View USGS ↗

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)
Silver Springs
NV 		760 322
Stagecoach
NV 		760 370
Yerington
NV 		760 207

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 -0.03 0.51 0.51
BSSA14 -0.20 0.55 0.58
CY14 +0.10 0.50 0.51
CB14 -0.03 0.52 0.52
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)
Power Line, Lahontan, NV, USA (NN.PWRL) 1.0050 Violent(IX) 41.853 Severe(VIII)
Dead Camel Mountains, Lahontan, NV, USA (NN.DEDC) 0.3428 Very Strong(VII) — —
Buffalo Canyon, Nevada w84gm (NN.BFC) 0.0084 Weak(III) 0.327 Weak(III)
Virginia City, Nevada gps (NN.VCN) 0.0075 Weak(III) 0.126 Weak(II)
Carson City Fire Station (NN.CF03) 0.0056 Weak(II) 0.368 Weak(III)
Carson City Fire Station (NN.CF01) 0.0043 Weak(II) 0.271 Weak(II)
Hidden Valley Golf Course w84gm (NN.HVGC) 0.0037 Weak(II) 0.232 Weak(II)
Carson City Fire Station (NN.CF02) 0.0035 Weak(II) 0.147 Weak(II)
Yerington, Nevada w84gm (NN.YER) 0.0035 Weak(II) 0.152 Weak(II)
Carson City School Admin. w84 (NN.CCAD) 0.0031 Weak(II) 0.137 Weak(II)
National Weather Station w84gm (NN.NOAA) 0.0031 Weak(II) 0.205 Weak(II)
Broken Hills, NV, USA (NN.BRH5) 0.0030 Weak(II) 0.161 Weak(II)
Eagle Valley School, CC w84 (NN.EGLV) 0.0029 Weak(II) 0.154 Weak(II)
Washoe County Golf w84gm (NN.WGLF) 0.0026 Weak(II) 0.209 Weak(II)
Sparks Marina w84 (NN.SMRN) 0.0024 Weak(II) 0.228 Weak(II)
Bishop Manogue Catholic High School, Reno, NV (NN.BMHS) 0.0021 Weak(II) 0.193 Weak(II)
RF07, 3050 Skyline Blvd. w84gm (NN.SKYF) 0.0021 Weak(II) 0.157 Weak(II)
Winnemucca Valley, Nevada w84 (NN.WVA) 0.0021 Weak(II) 0.092 Weak(II)
Queen Bee, Mono County, California (NN.QNBC) 0.0020 Weak(II) 0.051 Not felt(I)
RF05, 1500 Mayberry w84gm (NN.RF05) 0.0020 Weak(II) 0.106 Weak(II)
Sparks Treatment Plant w84gm (NN.SWTP) 0.0020 Weak(II) 0.079 Weak(II)
Bald Mtn, NV (NN.BALD) 0.0020 Weak(II) 0.101 Weak(II)
Rockland Comm. Site (NN.RKLD) 0.0019 Weak(II) 0.086 Weak(II)
Spanish Springs Fire Station (NN.SSFS) 0.0019 Weak(II) 0.197 Weak(II)
RF10, 5250 N. Virginia w84gm (NN.RFNV) 0.0018 Weak(II) 0.138 Weak(II)
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.

Ground Shaking Intensities — Interpolated ShakeMap MMI

3 sites
Location MMI Description
Silver Springs
NV 		Light(IV)
Stagecoach
NV 		Light(IV)
Yerington
NV 		Weak(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 Description
Power Line, Lahontan, NV, USA (NN.PWRL) Severe(VIII)
Dead Camel Mountains, Lahontan, NV, USA (NN.DEDC) Very Strong(VII)
Yerington, Nevada w84gm (NN.YER) Weak(II)