Errors from USGS Location and Magnitude:
EQPROC = 3.0km (1.8 mi)
HYPO2K = 2.3km (1.5 mi)
Magnitude = 0.1
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2026/07/28 22:39:10 37.410 -121.753 M2.3 8.3 8 km NE of Alum Rock, CA
EQPROC Summary:
2993 2026Jul28 2239 10.67 37.4074 -121.7197 8.50 0.19 29.1 59.5 210 5
MTUMZ SHZ PN 01 2026Jul28 2239 16.53 P D1 32.3 -0.33
ADUB1 SHZ PN 01 2026Jul28 2239 16.32 P U0 29.1 0.00
B054 EHZ PB -- 2026Jul28 2239 22.58 P U2 65.8 0.09
B058 EHZ PB -- 2026Jul28 2239 23.04 P U1 68.6 0.09
B057 EHZ PB -- 2026Jul28 2239 27.27 P ?0 101.6 -0.49
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2026-07-28 2239 10.79 37 25.842 121W44.443 8.73 0.17 3.81 16.29 2.21 2.21E 8.70
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
5 5 29.4 Emb 215 6 4 4 0 5 - 3 1.10 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
2.21 3 1.10 E 33 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 29.4 227 103 PU 16.32 5.53 5.38 0.00 0.15 1.14 W 0.999 0.00 35.0 2.60 E
MTUMZPN SHZ 01 A 33.8 205 101 PD 1 16.53 5.74 6.08 0.00 -0.34 0.86 W 0.999 0.00 15.0 1.81 E
B054 PB EHZ -- A 62.5 320 96 PU 2 22.58 11.79 10.70 0.00 1.09* 0.00 W 0.000 0.00 19.0 2.10 E
B058 PB EHZ -- A 71.5 168 95 PU 1 23.04 12.25 12.14 0.00 0.11 0.86 W 1.000 0.00 5.00 4 0.82XE
B057 PB EHZ -- A 98.3 313 93 P 27.27 16.48 16.50 0.00 -0.02 1.14 W 1.000 0.00 7.00 4 1.17XE