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Intensity Lab
III

Max Est. MMI

M3.8 earthquake · shaking intensity by town 8 km NNE of Delta, B.C., MX

Magnitude3.8
Depth20.7 km
Time 2026-11-03T18:17:14.020000Z UTC: 2026-11-03T18:17:14.020000Z
USGS ID ci41572056
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)
Ejido Vicente Guerrero
MX 		760 191
Ejido Saltillo
MX 		760 205
Nuevo León
MX 		760 198

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 -0.16 0.51 0.53
BSSA14 -0.03 0.42 0.41
CY14 -0.18 0.52 0.55
CB14 -0.18 0.52 0.55
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)
Ejido Aguascalientes (BC.AGSX) 0.0038 Weak(II) 0.102 Weak(II)
Bonds Corner, Omlin Residence (NP.5054) 0.0034 Weak(II) 0.099 Weak(II)
El Centro (CI.ELO) 0.0021 Weak(II) 0.048 Not felt(I)
Desert Research Extended Center (CI.DRE) 0.0018 Weak(II) 0.072 Weak(II)
El Centro Array 11, McCabe School (NP.5058) 0.0017 Weak(II) 0.059 Weak(II)
Schaffner Ranch (CI.SNR) 0.0015 Weak(II) 0.059 Weak(II)
East Mesa (CI.EMS) 0.0011 Not felt(I) 0.027 Not felt(I)
Midway Well (NP.5272) 0.0010 Not felt(I) 0.019 Not felt(I)
El Centro Array 1, Borchard Ranches (NP.5056) 0.0009 Not felt(I) 0.031 Not felt(I)
Fire Station (NP.5053) 0.0009 Not felt(I) 0.030 Not felt(I)
Coachella (CI.COA) 0.0008 Not felt(I) 0.028 Not felt(I)
Campo Elementary School (CI.CPO) 0.0007 Not felt(I) 0.006 Not felt(I)
Imperial (CI.IMP) 0.0006 Not felt(I) 0.025 Not felt(I)
American Girl Mine (CI.AGM) 0.0005 Not felt(I) 0.011 Not felt(I)
Signal Mtn (CI.SGL) 0.0004 Not felt(I) 0.013 Not felt(I)
Ocotillo Community Park (CI.OCP) 0.0004 Not felt(I) 0.013 Not felt(I)
Camino Del Diablo (CI.CDD) 0.0004 Not felt(I) 0.005 Not felt(I)
Ruthven (CI.RUN) 0.0004 Not felt(I) 0.011 Not felt(I)
Yuha Desert (CI.YUH2) 0.0003 Not felt(I) 0.005 Not felt(I)
Rancho Alamar- (BC.ALAMX) 0.0003 Not felt(I) 0.012 Not felt(I)
Cabazon (CI.CZN) 0.0003 Not felt(I) 0.002 Not felt(I)
Rumorosa (BC.RMX) 0.0002 Not felt(I) 0.006 Not felt(I)
Glamis (CI.GLA) 0.0002 Not felt(I) 0.007 Not felt(I)
Otay Lakes Park (CI.OLP) 0.0002 Not felt(I) 0.006 Not felt(I)
Rancho Hardy (BC.RHX) 0.0002 Not felt(I) 0.006 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
Ejido Vicente Guerrero
MX 		Weak(III)
Ejido Saltillo
MX 		Weak(III)
Nuevo León
MX 		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
Ojos Negros (BC.OJONX) Moderate(V)
Ejido Aguascalientes (BC.AGSX) Weak(II)
Midway Well (NP.5272) Not felt(I)