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Intensity Lab
III

Max Est. MMI

M3.6 earthquake · shaking intensity by town 8 km WNW of Delta, B.C., MX

Magnitude3.6
Depth3.3 km
Time 2026-02-11T08:40:36.870000Z UTC: 2026-02-11T08:40:36.870000Z
USGS ID ci41395592
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)
Nuevo León
MX 		760 198
Delta
MX 		760 190
Michoacán de Ocampo
MX 		760 187

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 +0.04 0.23 0.23
BSSA14 +0.05 0.25 0.25
CY14 +0.08 0.28 0.29
CB14 +0.07 0.28 0.29
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)
CERRO PRIETO (BC.CPX) 0.0121 Weak(III) 0.802 Weak(III)
Ejido Tlaxcala (BC.TL2X) 0.0067 Weak(III) 0.310 Weak(III)
Guadalupe Victoria (BC.GUVIX) 0.0062 Weak(III) 0.284 Weak(III)
Ejido Aguascalientes (BC.AGSX) 0.0038 Weak(II) 0.107 Weak(II)
Riito (BC.RITX) 0.0021 Weak(II) 0.087 Weak(II)
Desert Research Extended Center (CI.DRE) 0.0019 Weak(II) 0.134 Weak(II)
El Centro (CI.ELO) 0.0016 Weak(II) 0.097 Weak(II)
CA:El Centro;ECA11 McCabe Sch (NP.5058) 0.0015 Weak(II) 0.089 Weak(II)
East Mesa (CI.EMS) 0.0012 Not felt(I) 0.088 Weak(II)
Pescaderos la 14 (BC.PESCX) 0.0012 Not felt(I) 0.103 Weak(II)
Rancho Alamar- (BC.ALAMX) 0.0012 Not felt(I) 0.033 Not felt(I)
UABC Campus Mexicali (BC.UABX) 0.0009 Not felt(I) 0.075 Weak(II)
Bonds Corner, Omlin Residence (NP.5054) 0.0009 Not felt(I) 0.074 Weak(II)
Imperial (CI.IMP) 0.0006 Not felt(I) 0.091 Weak(II)
Tecate (BC.TKX) 0.0005 Not felt(I) 0.009 Not felt(I)
Rancho Hardy (BC.RHX) 0.0005 Not felt(I) 0.012 Not felt(I)
Schaffner Ranch (CI.SNR) 0.0005 Not felt(I) 0.143 Weak(II)
Coachella (CI.COA) 0.0004 Not felt(I) 0.107 Weak(II)
Ivy Glen (CI.IVY) 0.0004 Not felt(I) 0.004 Not felt(I)
Ejido Heriberto Jara (BC.JARAX) 0.0003 Not felt(I) 0.029 Not felt(I)
El Chinero (BC.CHX) 0.0003 Not felt(I) 0.007 Not felt(I)
American Girl Mine (CI.AGM) 0.0003 Not felt(I) 0.010 Not felt(I)
Mira Loma (CI.MLS) 0.0003 Not felt(I) 0.004 Not felt(I)
San Luis Rio Colorado (BC.SLRCX) 0.0002 Not felt(I) 0.042 Not felt(I)
Signal Mtn (CI.SGL) 0.0002 Not felt(I) 0.011 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
Nuevo León
MX 		Weak(III)
Delta
MX 		Weak(III)
Michoacán de Ocampo
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
CERRO PRIETO (BC.CPX) Weak(III)
Ejido Tlaxcala (BC.TL2X) Weak(III)
Ejido Aguascalientes (BC.AGSX) Weak(II)