Errors from USGS Location and Magnitude:
EQPROC = 5.3km (3.3 mi)
HYPO2K = 6.4km (4.0 mi)
Magnitude = -0.4
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2025/10/18 09:23:17 37.344 -121.704 M2.3 7.7 11 km ESE of Alum Rock, CA
EQPROC Summary:
2820 2025Oct18 923 18.30 37.3465 -121.7634 10.79 0.07 35.9 59.9 199 6
GLFBZ SHZ PN 01 2025Oct18 923 25.08 P ?1 35.9 -0.09
LCGPZ SHZ PN 01 2025Oct18 923 26.73 P U0 45.3 -0.00
ATZ SHZ PN 01 2025Oct18 923 26.28 P ?0 42.6 -0.00
B054 EHZ PB -- 2025Oct18 923 30.41 P D2 68.8 -0.00
B058 EHZ PB -- 2025Oct18 923 28.68 P D2 62.9 -0.86
B057 EHZ PB -- 2025Oct18 923 35.43 P U1 103.6 -0.00
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2025-10-18 0923 17.53 37 23.133 121W39.960 11.64 0.08 2.03 9.58 2.65 2.65E 11.63
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 43.4 Emb 220 8 4 5 0 6 - 3 1.32 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
2.65 3 1.32 E 11 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
GLFBZPN SHZ 01 A 43.4 279 103 P 1 25.08 7.55 7.71 0.00 -0.16 0.94 W 0.765 0.00 15.0 1.87 E
ATZ PN SHZ 01 A 49.7 205 101 P 26.28 8.75 8.71 0.00 0.04 1.25 W 0.933 0.00 74.0 3.42 E
LCGPZPN SHZ 01 A 52.4 284 100 PU 26.73 9.20 9.13 0.00 0.07 1.25 W 0.529 0.00 17.0 2.00 E
B058 PB EHZ -- A 65.5 173 98 PD 2 28.68 11.15 11.23 0.00 -0.08 0.62 W 0.874 0.00 5.00 4 0.84XE
B054 PB EHZ -- A 70.7 319 97 PD 2 30.41 12.88 12.07 0.00 0.81* 0.00 W 0.000 0.00 7.00 4 1.17XE
B057 PB EHZ -- A106.6 313 95 PU 1 35.43 17.90 17.88 0.00 0.02 0.94 W 0.897 0.00 5.00 4 0.88XE