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Intensity Lab
III

Max Est. MMI

M3.6 earthquake · shaking intensity by town 4 km S of Banning, CA

Magnitude3.6
Depth14.0 km
Time 2026-02-17T18:57:13.590000Z UTC: 2026-02-17T18:57:13.590000Z
USGS ID ci41187255
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)
Banning
CA 		760 352
Cabazon
CA 		760 352
Beaumont
CA 		760 371

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 0.25 0.26
BSSA14 +0.02 0.23 0.23
CY14 -0.08 0.25 0.26
CB14 -0.08 0.25 0.27
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)
Idyllwild (CI.IDY) 0.0153 Weak(III) 0.173 Weak(II)
Mt. San Jacinto Campus (CI.MSJ) 0.0128 Weak(III) 0.258 Weak(II)
Mission Creek (CI.MSC) 0.0103 Weak(III) 0.177 Weak(II)
Hemet 2 (CI.HMT2) 0.0086 Weak(III) 0.141 Weak(II)
Polly Butte 2 (CI.POB2) 0.0079 Weak(III) 0.183 Weak(II)
Beaumont Base (CI.BBS) 0.0079 Weak(III) 0.226 Weak(II)
Forest Home (CI.FHO) 0.0071 Weak(III) 0.181 Weak(II)
Skyland Ranch (CI.SLR) 0.0068 Weak(III) 0.134 Weak(II)
Cabazon (CI.CZN) 0.0066 Weak(III) 0.110 Weak(II)
Domenigoni (CI.DGR) 0.0053 Weak(II) 0.062 Weak(II)
Lake Perris (CI.PER) 0.0050 Weak(II) 0.115 Weak(II)
Big Bear Solar Observatory (CI.BBR) 0.0044 Weak(II) 0.111 Weak(II)
Seven Oaks (CI.SVD) 0.0043 Weak(II) 0.094 Weak(II)
Murrieta (CI.MUR) 0.0039 Weak(II) 0.089 Weak(II)
Camp Scherman (CI.CSH) 0.0039 Weak(II) 0.060 Weak(II)
Garner Valley (SB.GVDA) 0.0037 Weak(II) 0.065 Weak(II)
Keenwild Fire Station, Mountain Center, CA, USA (AZ.KNW) 0.0037 Weak(II) 0.035 Not felt(I)
Bachelor Mountain (CI.BAC) 0.0035 Weak(II) 0.040 Not felt(I)
West Wide Canyon (CI.WWC) 0.0032 Weak(II) 0.090 Weak(II)
Devers (CI.DEV) 0.0031 Weak(II) 0.074 Weak(II)
Valley (CI.VLY) 0.0030 Weak(II) 0.054 Not felt(I)
Palm Springs Desert Museum (CI.PSD) 0.0025 Weak(II) 0.051 Not felt(I)
Lake Mathews Hills (CI.LMH) 0.0024 Weak(II) 0.056 Not felt(I)
Lucerne Valley 2 (CI.LUC2) 0.0022 Weak(II) 0.088 Weak(II)
Dunn Ranch (CI.DNR) 0.0021 Weak(II) 0.053 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
Banning
CA 		Weak(III)
Cabazon
CA 		Weak(III)
Beaumont
CA 		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
Cabazon (CI.CZN) Weak(II)
Skyland Ranch (CI.SLR) Weak(II)
Beaumont Base (CI.BBS) Weak(III)