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Intensity Lab
III

Max Est. MMI

M3.8 earthquake · shaking intensity by town 11 km NW of Summerlin South, Nevada

Magnitude3.8
Depth7.0 km
Time 2026-06-04T20:47:58.995000Z UTC: 2026-06-04T20:47:58.995000Z
USGS ID nn00919749
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)
Summerlin South
NV 		760 398
Spring Valley
NV 		760 328
Enterprise
NV 		760 361

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 +0.17 0.36 0.39
BSSA14 +0.17 0.34 0.37
CY14 +0.17 0.33 0.37
CB14 +0.19 0.35 0.39
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)
Red Rock Park, Nevada w84gm (NN.RRK) 0.0239 Weak(III) 0.433 Weak(III)
Summerlin Fire Station 7, West LV (SUMR) (NN.LV07) 0.0224 Weak(III) 0.423 Weak(III)
Clark County Firehouse 12; ANSS SM w84gm (NN.CC12) 0.0125 Weak(III) 0.303 Weak(III)
7433 Soaring Heights Ave, Las Vegas (NN.WTNK) 0.0103 Weak(III) 0.120 Weak(II)
Hyde High School, LLNL/ANSS BB+SM w84 (NN.HYDE) 0.0088 Weak(III) 0.265 Weak(II)
Angel Comm. Site, Clark County (NN.AGLV) 0.0083 Weak(III) 0.190 Weak(II)
Las Vegas Fire Station (NN.LV04) 0.0048 Weak(II) 0.144 Weak(II)
Henderson FS (NN.HF05) 0.0044 Weak(II) 0.148 Weak(II)
Vocational High School w84gm (NN.VOTK) 0.0033 Weak(II) 0.149 Weak(II)
Las Vegas Fire Station (NN.LV09) 0.0031 Weak(II) 0.124 Weak(II)
Mountain Pass (CI.MTP) 0.0021 Weak(II) 0.033 Not felt(I)
Indian Springs High School, NV, CEMP (QN.ISHS) 0.0019 Weak(II) 0.032 Not felt(I)
Tecopa, CA, CEMP (QN.TCPC) 0.0013 Not felt(I) 0.040 Not felt(I)
Nipton (CI.NPN) 0.0011 Not felt(I) 0.032 Not felt(I)
Shoshone (CI.SHO) 0.0011 Not felt(I) 0.035 Not felt(I)
Greenwater Valley, CA. (GPS 03/05/2015) w84gm (NN.GWY) 0.0007 Not felt(I) 0.027 Not felt(I)
Lanfair (CI.LDF) 0.0006 Not felt(I) 0.021 Not felt(I)
Furnace Creek (CI.FUR) 0.0006 Not felt(I) 0.019 Not felt(I)
Queen of Sheba Mine, CA. (GPS 01/17/2001) w84gm (NN.QSM) 0.0005 Not felt(I) 0.012 Not felt(I)
Beatty Postal Station, NV, CEMP (QN.BTPS) 0.0005 Not felt(I) 0.017 Not felt(I)
Hole In The Wall (CI.HIW) 0.0005 Not felt(I) 0.028 Not felt(I)
Rogers Peak (CI.RPK) 0.0004 Not felt(I) 0.012 Not felt(I)
Turquoise Mountain (CI.TUQ) 0.0003 Not felt(I) 0.017 Not felt(I)
Goffs (CI.GFF) 0.0003 Not felt(I) 0.012 Not felt(I)
Sheep Range, Nevada w84gm (NN.SHP) 0.0003 Not felt(I) 0.012 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.

Ground Shaking Intensities — Interpolated ShakeMap MMI

3 sites
Location MMI Description
Summerlin South
NV 		Weak(III)
Spring Valley
NV 		Weak(III)
Enterprise
NV 		Weak(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 Description
Summerlin Fire Station 7, West LV (SUMR) (NN.LV07) Weak(III)
Red Rock Park, Nevada w84gm (NN.RRK) Weak(III)
Las Vegas Fire Station (NN.LV09) Weak(II)