Errors from USGS Location and Magnitude:
EQPROC = 19.4km (12.1mi)
HYPO2K = 20.9km (13.0mi)
Magnitude = -0.5
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2026/02/03 05:06:14 37.410 -121.754 M2.1 7.7 8 km NE of Alum Rock, CA
EQPROC Summary:
2906 2026Feb 3 506 16.94 37.4089 -121.9736 3.50 0.20 18.0 57.1 141 6
ADUB1 SHZ PN 01 2026Feb 3 506 20.58 P U2 18.0 -0.05
ATZ SHZ PN 01 2026Feb 3 506 25.77 P ?0 48.3 -0.00
RE9A7 EHZ AM 00 2026Feb 3 506 27.72 P ?0 59.8 0.00
B054 EHZ PB -- 2026Feb 3 506 26.73 P D1 54.0 0.00
B058 EHZ PB -- 2026Feb 3 506 27.28 P U2 76.1 -3.20
B057 EHZ PB -- 2026Feb 3 506 31.76 P ?1 86.3 -0.45
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2026-02-03 0506 17.40 37 24.437 121W58.999 3.52 0.08 0.69 9.84 2.62 2.62E 3.50
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
6 6 17.8 Emb 145 7 3 5 0 6 - 3 1.74 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
2.62 3 1.74 E 13 5 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
ADUB1PN SHZ 01 A 17.8 179 95 PU 2 20.58 3.18 3.37 0.00 -0.19 0.62 W 0.964 0.00 33.0 2.47 E
ATZ PN SHZ 01 A 48.2 171 91 P 25.77 8.37 8.31 0.00 0.06 1.25 W 0.976 0.00 45.0 2 2.91 E
B054 PB EHZ -- A 53.8 340 91 PD 1 26.73 9.33 9.22 0.00 0.11 0.94 W 0.468 0.00 3.00 4 0.31XE
RE9A7AM EHZ 00 A 60.6 55 91 P 27.72 10.32 10.34 0.00 -0.02 1.25 W 0.981 0.00 46.0 2 2.95 E
B058 PB EHZ -- A 76.4 151 91 PU 2 27.28 9.88 12.90 0.00 -3.02* 0.00 W 0.000 0.00 1.00 4
B057 PB EHZ -- A 85.9 324 91 P 1 31.76 14.36 14.45 0.00 -0.09 0.94 W 0.608 0.00 3.00 4 0.34XE