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Max Est. MMI

M4.1 earthquake · shaking intensity by town 19 km SE of Joseph, Oregon

Magnitude4.1
Depth20.8 km
Time 2026-11-10T07:42:53.040000Z UTC: 2026-11-10T07:42:53.040000Z
USGS ID uw714136981
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)
Joseph
OR 		760 227
Enterprise
OR 		760 163
Union
OR 		760 464

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, estimated 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 -0.07 0.31 0.31
BSSA14 +0.04 0.20 0.21
CY14 -0.09 0.27 0.28
CB14 -0.10 0.26 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)
Enterprise, Oregon, USA (UO.WALLO) 0.0064 Weak(III) 0.191 Weak(II)
Union, OR, USA (UO.LADD) 0.0032 Weak(II) 0.154 Weak(II)
Enterprise, OR, USA (UW.BRAN) 0.0029 Weak(II) 0.081 Weak(II)
Taylor Ranch, Idaho (WW.TYLR) 0.0008 Not felt(I) 0.031 Not felt(I)
Emerald Creek, Idaho (WW.BILL) 0.0006 Not felt(I) 0.022 Not felt(I)
100 K Area, Hanford, WA, USA (UW.H1K) 0.0006 Not felt(I) 0.025 Not felt(I)
Umatilla, OR, USA (UW.UMAT) 0.0006 Not felt(I) 0.015 Not felt(I)
Tomer Butte, Idaho (WW.TBID) 0.0005 Not felt(I) 0.025 Not felt(I)
Pullman, WA, USA (UW.COUGS) 0.0005 Not felt(I) 0.015 Not felt(I)
Rattlesnake Mtn, Hanford, WA, USA (UW.RSW2) 0.0004 Not felt(I) 0.005 Not felt(I)
Agriculture Northwest Farmland, Eureka, WA, USA (UW.AGNW) 0.0004 Not felt(I) 0.026 Not felt(I)
Prairie City, OR, USA (UO.JODA) 0.0004 Not felt(I) 0.011 Not felt(I)
Ione, OR, USA (UO.JOBT) 0.0003 Not felt(I) 0.014 Not felt(I)
McClure Farm, Touchet, WA, USA (UW.TOUCH) 0.0003 Not felt(I) 0.015 Not felt(I)
Les Collines Vineyard, Walla Walla, WA, USA (UW.LCV) 0.0003 Not felt(I) 0.013 Not felt(I)
Starbuck, WA, USA (UW.TUCA) 0.0002 Not felt(I) 0.006 Not felt(I)
Walla Walla HS ANSS SMO (UW.WWHS) 0.0002 Not felt(I) 0.010 Not felt(I)
Adams, OR, USA (UO.CBARC) 0.0002 Not felt(I) 0.010 Not felt(I)
Lincton Mt., OR, USA (UW.LNO) 0.0002 Not felt(I) 0.007 Not felt(I)
Prosser, WA, USA (UW.PRO) 0.0002 Not felt(I) 0.011 Not felt(I)
Camels Hump (MB.CPMT) 0.0002 Not felt(I) 0.005 Not felt(I)
Dayton, WA, USA (UW.DATON) 0.0002 Not felt(I) 0.007 Not felt(I)
400 Area, Hanford, WA, USA (UW.H4A) 0.0002 Not felt(I) 0.008 Not felt(I)
Bender Cr (MB.BNMT) 0.0002 Not felt(I) 0.005 Not felt(I)
Spokane Valley, WA, USA (UW.CVSD) 0.0002 Not felt(I) 0.010 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
Joseph
OR 		Weak(III)
Enterprise
OR 		Weak(III)
Union
OR 		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
Enterprise, Oregon, USA (UO.WALLO) Weak(II)
Union, OR, USA (UO.LADD) Weak(II)
Enterprise, OR, USA (UW.BRAN) Weak(II)