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IV

Max Est. MMI

19 km SE of Silver Springs, Nevada

Magnitude4.8
Depth7.5 km
Time 2026-04-22T17:23:37.085000Z UTC: 2026-04-22T17:23:37.085000Z
USGS ID nn00916046
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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)
Pah Rah Range, Nevada w84gm (NN.PAH) Weak(II)
Redfield Campus, S. Reno, Nevada (NN.REDF) 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 +0.44 0.44 0.62
BSSA14 +0.43 0.44 0.61
CY14 +0.47 0.48 0.67
CB14 +0.47 0.48 0.67
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) 0.0084 Weak(II) 0.327 Weak(III)
Yerington, Nevada w84gm (NN.YER) 0.0035 Not felt(I) 0.152 Weak(II)
Bishop Manogue Catholic High School, Reno, NV (NN.BMHS) 0.0021 Not felt(I) 0.193 Weak(II)
Winnemucca Valley, Nevada w84 (NN.WVA) 0.0021 Not felt(I) 0.092 Weak(II)
Queen Bee, Mono County, California (NN.QNBC) 0.0020 Not felt(I) 0.051 Not felt(I)
Bald Mtn, NV (NN.BALD) 0.0020 Not felt(I) 0.101 Weak(II)
Rockland Comm. Site (NN.RKLD) 0.0019 Not felt(I) 0.086 Weak(II)
Kaiserville, Nevada w84gm (NN.KVN) 0.0017 Not felt(I) 0.076 Weak(II)
Redfield Campus, S. Reno, Nevada (NN.REDF) 0.0016 Not felt(I) 0.060 Weak(II)
Pah Rah Range, Nevada w84gm (NN.PAH) 0.0016 Not felt(I) 0.104 Weak(II)
Thunderbird Lodge, Lake Tahoe, NV (NN.TBRD) 0.0014 Not felt(I) 0.057 Weak(II)
Antelope Valley (NC.MAV) 0.0014 Not felt(I) 0.088 Weak(II)
Washoe County DEM, Nevada (NN.WDEM) 0.0014 Not felt(I) 0.088 Weak(II)
Zephyr Cove, Lake Tahoe, Nevada (NN.ZPR) 0.0013 Not felt(I) 0.066 Weak(II)
Bunker Hill, Placer County, CA (NN.BUNK) 0.0013 Not felt(I) 0.035 Not felt(I)
Minden/Gardnerville Fire Stn RT130-ANSS w84gm (NN.MND1) 0.0012 Not felt(I) 0.086 Weak(II)
TV Hill 1, Hawthorne, NV (NN.TVH1) 0.0012 Not felt(I) 0.067 Weak(II)
Washoe Valley, Nevada;Laurence Kaplan Property (NN.WASH) 0.0012 Not felt(I) 0.052 Not felt(I)
Sage Hen site 5, Independence Lake, CA (NN.SAG5) 0.0012 Not felt(I) 0.072 Weak(II)
Chalk Mountain, Churchill County, NV, USA (NN.CMK6) 0.0011 Not felt(I) 0.042 Not felt(I)
Weber Reservoir, near Camino (BK.WEBR) 0.0011 Not felt(I) 0.032 Not felt(I)
Lower Ebbet's Pass, California (NN.EBPB) 0.0011 Not felt(I) 0.040 Not felt(I)
Pyramid Lake 2 (NN.PYM2) 0.0011 Not felt(I) 0.057 Weak(II)
Weller Cave, Western Cave Conservancy, Sutter Creek, CA (BK.WELL) 0.0011 Not felt(I) 0.036 Not felt(I)
Blue Mountain (BK.BLUE) 0.0010 Not felt(I) 0.040 Not felt(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.