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IV

Max Est. MMI

20 km SE of Silver Springs, Nevada

Magnitude4.5
Depth9.6 km
Time 2026-04-19T14:39:16.331000Z UTC: 2026-04-19T14:39:16.331000Z
USGS ID nn00915543
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Ground Shaking Intensities — Interpolated ShakeMap MMI

3 sites
Location MMI Description
Silver Springs
NV
Light(IV)
Stagecoach
NV
Weak(III)
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
Yerington, Nevada w84gm (NN.YER) Weak(II)
Pine Nut, Nevada w84 (NN.PNT) Weak(III)
Pah Rah Range, Nevada w84gm (NN.PAH) Weak(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)
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 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 +0.30 0.47 0.55
BSSA14 +0.29 0.47 0.55
CY14 +0.29 0.46 0.55
CB14 +0.29 0.46 0.54
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)
Pine Nut, Nevada w84 (NN.PNT) 0.0057 Not felt(I)
Buffalo Canyon, Nevada w84gm (NN.BFC) 0.0043 Not felt(I) 0.198 Weak(III)
Yerington, Nevada w84gm (NN.YER) 0.0035 Not felt(I) 0.105 Weak(II)
Bishop Manogue Catholic High School, Reno, NV (NN.BMHS) 0.0021 Not felt(I) 0.128 Weak(II)
Redfield Campus, S. Reno, Nevada (NN.REDF) 0.0019 Not felt(I) 0.080 Weak(II)
Kaiserville, Nevada w84gm (NN.KVN) 0.0017 Not felt(I) 0.066 Weak(II)
Winnemucca Valley, Nevada w84 (NN.WVA) 0.0016 Not felt(I) 0.089 Weak(II)
Rockland Comm. Site (NN.RKLD) 0.0015 Not felt(I) 0.067 Weak(II)
Highway Maintenance Yard (NP.2021) 0.0014 Not felt(I) 0.050 Weak(II)
TV Hill 1, Hawthorne, NV (NN.TVH1) 0.0014 Not felt(I) 0.079 Weak(II)
Queen Bee, Mono County, California (NN.QNBC) 0.0013 Not felt(I) 0.063 Weak(II)
Bald Mtn, NV (NN.BALD) 0.0012 Not felt(I) 0.069 Weak(II)
Pah Rah Range, Nevada w84gm (NN.PAH) 0.0012 Not felt(I) 0.052 Weak(II)
Black Rock Springs, NV, USA (NN.BRS2) 0.0012 Not felt(I) 0.040 Weak(II)
Washoe Valley, Nevada;Laurence Kaplan Property (NN.WASH) 0.0011 Not felt(I) 0.031 Weak(II)
Lower Ebbet's Pass, California (NN.EBPB) 0.0010 Not felt(I) 0.040 Weak(II)
Weber Reservoir, near Camino (BK.WEBR) 0.0010 Not felt(I) 0.024 Not felt(I)
Zephyr Cove, Lake Tahoe, Nevada (NN.ZPR) 0.0010 Not felt(I) 0.030 Weak(II)
Thunderbird Lodge, Lake Tahoe, NV (NN.TBRD) 0.0009 Not felt(I) 0.037 Weak(II)
Warrior Mine, Nye County, NV, USA (NN.WAR3) 0.0009 Not felt(I) 0.045 Weak(II)
Antelope Valley (NC.MAV) 0.0009 Not felt(I) 0.065 Weak(II)
Sage Hen site 5, Independence Lake, CA (NN.SAG5) 0.0008 Not felt(I) 0.042 Weak(II)
Columbia College (BK.CMB) 0.0008 Not felt(I) 0.016 Not felt(I)
Sierra Vista (NC.MSVB) 0.0008 Not felt(I) 0.018 Not felt(I)
Pyramid Lake 2 (NN.PYM2) 0.0008 Not felt(I) 0.057 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.