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Intensity Lab
IV

Max Est. MMI

M5.2 earthquake · shaking intensity by town 19 km SE of Silver Springs, Nevada

Magnitude5.2
Depth5.0 km
Time 2026-05-01T08:17:19.870000Z UTC: 2026-05-01T08:17:19.870000Z
USGS ID nn00916980
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
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 -0.22 0.38 0.44
BSSA14 -0.52 0.36 0.63
CY14 -0.18 0.35 0.39
CB14 -0.24 0.36 0.43
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)
Hidden Valley Golf Course w84gm (NN.HVGC) 0.0145 Weak(III) 0.530 Weak(III)
National Weather Station w84gm (NN.NOAA) 0.0079 Weak(III) 0.286 Weak(III)
Buffalo Canyon, Nevada w84gm (NN.BFC) 0.0069 Weak(III) 0.370 Weak(III)
Spanish Springs Fire Station (NN.SSFS) 0.0069 Weak(III) 0.378 Weak(III)
Carson City Fire Station (NN.CF03) 0.0069 Weak(III) 0.488 Weak(III)
Carson City Fire Station (NN.CF02) 0.0060 Weak(III) 0.294 Weak(III)
Carson City School Admin. w84 (NN.CCAD) 0.0051 Weak(II) 0.186 Weak(II)
Yerington, Nevada w84gm (NN.YER) 0.0050 Weak(II) 0.336 Weak(III)
Picolo Elementary School w84gm (NN.PICO) 0.0048 Weak(II) 0.247 Weak(II)
Sparks Marina w84 (NN.SMRN) 0.0048 Weak(II) 0.441 Weak(III)
Washoe County Golf w84gm (NN.WGLF) 0.0045 Weak(II) 0.384 Weak(III)
RF05, 1500 Mayberry w84gm (NN.RF05) 0.0044 Weak(II) 0.176 Weak(II)
Broken Hills, NV, USA (NN.BRH5) 0.0039 Weak(II) 0.168 Weak(II)
Eagle Valley School, CC w84 (NN.EGLV) 0.0038 Weak(II) 0.175 Weak(II)
Dixie Hot Springs, Nevada w84 (NN.DIX) 0.0035 Weak(II) 0.184 Weak(II)
Pah Rah Range, Nevada w84gm (NN.PAH) 0.0032 Weak(II) 0.158 Weak(II)
Bishop Manogue Catholic High School, Reno, NV (NN.BMHS) 0.0032 Weak(II) 0.295 Weak(III)
Nevada Mental Health Svc. w84gm (NN.NMHS) 0.0031 Weak(II) 0.218 Weak(II)
RF10, 5250 N. Virginia w84gm (NN.RFNV) 0.0029 Weak(II) 0.174 Weak(II)
Sparks High School w84 (NN.SPHI) 0.0028 Weak(II) 0.290 Weak(III)
Bunker Hill, Placer County, CA (NN.BUNK) 0.0028 Weak(II) 0.063 Weak(II)
Queen Bee, Mono County, California (NN.QNBC) 0.0026 Weak(II) 0.110 Weak(II)
Pyramid Lake 2 (NN.PYM2) 0.0026 Weak(II) 0.098 Weak(II)
Rockland Comm. Site (NN.RKLD) 0.0025 Weak(II) 0.130 Weak(II)
Thunderbird Lodge, Lake Tahoe, NV (NN.TBRD) 0.0025 Weak(II) 0.099 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)
Fallon
NV 		Light(IV)
Stagecoach
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
Yerington, Nevada w84gm (NN.YER) Weak(III)
Virginia City, Nevada gps (NN.VCN) Weak(II)
Pah Rah Range, Nevada w84gm (NN.PAH) Weak(II)