Errors from USGS Location and Magnitude:
EQPROC = 4.9km (3.0 mi)
HYPO2K = 4.8km (3.0 mi)
Magnitude = 0.4
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2026/08/21 11:38:49 37.725 -122.261 M2.3 18.2 5 km SSW of Alameda, CA
EQPROC Summary:
3005 2026Aug21 1138 49.50 37.7129 -122.3142 11.16 0.00 19.2 38.3 173 4
GLFBZ SHZ PN 01 2026Aug21 1138 55.92 P ?0 33.1 0.00
ADUB1 SHZ PN 01 2026Aug21 1139 0.23 P U0 59.5 0.01
B054 EHZ PB -- 2026Aug21 1138 53.70 P U0 19.2 0.00
B057 EHZ PB -- 2026Aug21 1138 57.29 P D0 41.4 0.00
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2026-08-21 1138 50.02 37 42.871 122W18.567 7.74 0.02 1.23 6.23 1.85 1.85E 7.73
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
4 4 18.8 Emb 174 5 3 4 0 4 - 4 1.85 E W W
XMAG2-N.XMG2-XMMAD-T-S FMAG2-N.FMG2-FMMAD-T-S PREF.MAG-N.PMAG-PRMAD-T DEPDAT NS ZT TYP
1.85 4 1.85 E 13 4 M CRH
REGION=
STA NET COM L CR DIST AZM AN P/S WT SEC (TOBS -TCAL -DLY =RES) WT SR INFO CAL DUR-W-FMAG-T -AMP-U-PER-W-XMAG-T DE
B054 PB EHZ -- A 18.8 30 108 PU 53.70 3.68 3.69 0.00 -0.01 1.00 W 1.000 0.00 21.0 2.04 E
GLFBZPN SHZ 01 A 33.1 154 100 P 55.92 5.90 5.93 0.00 -0.03 1.00 W 0.999 0.00 13.0 1.66 E
B057 PB EHZ -- A 41.4 328 98 PD 57.29 7.27 7.27 0.00 -0.00 1.00 W 0.999 0.00 21.0 2.17 E
ADUB1PN SHZ 01 A 59.5 150 95 PU 60.23 10.21 10.18 0.00 0.03 1.00 W 0.999 0.00 24.0 2.32 E