Errors from USGS Location and Magnitude:
EQPROC = 0.8km (0.5 mi)
HYPO2K = 6.4km (4.0 mi)
Magnitude = -0.4
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2026/09/17 03:07:43 37.335 -121.595 M2.6 6.3 21 km E of Alum Rock, CA
EQPROC Summary:
3018 2026Sep17 307 43.32 37.3280 -121.5985 10.25 0.11 32.8 78.7 189 7
MTUMZ SHZ PN 01 2026Sep17 307 49.58 P U0 32.8 -0.07
ADUB1 SHZ PN 01 2026Sep17 307 50.13 P D0 34.9 0.14
ATZ SHZ PN 01 2026Sep17 307 52.45 P ?2 47.0 0.42
B058 EHZ PB -- 2026Sep17 307 54.10 P U2 58.7 0.11
B054 EHZ PB -- 2026Sep17 307 57.03 P U1 79.4 0.00
B057 EHZ PB -- 2026Sep17 308 2.16 Pg?3 115.4 -0.12
B073 EHZ PB -- 2026Sep17 308 12.02 PgD3 182.9 -0.11
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2026-09-17 0307 43.80 37 18.635 121W39.225 20.33 0.13 5.78 8.67 2.97 2.97E 20.29
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
7 7 27.8 Emb 211 13 5 5 0 7 - 5 0.55 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
2.97 5 0.55 E 34 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
MTUMZPN SHZ 01 A 27.8 232 116 PU 49.58 5.78 5.92 0.00 -0.14 1.70 W 0.914 0.00 23.0 2.33 E
ADUB1PN SHZ 01 A 29.8 257 113 PD 50.13 6.33 6.19 0.00 0.14 1.70 W 0.908 0.00 55.0 3.18 E
ATZ PN SHZ 01 A 42.8 211 98 P 2 52.45 8.65 8.05 0.00 0.60* 0.00 W 0.000 0.00 73.0 2 3.52 E
B058 PB EHZ -- A 57.1 173 91 PU 2 54.10 10.30 10.18 0.00 0.12 0.85 W 0.972 0.00 23.0 2.42 E
B054 PB EHZ -- A 77.7 322 90 PU 1 57.03 13.23 13.26 0.00 -0.03 1.28 W 0.959 0.00 31.0 2.73 E
B057 PB EHZ -- A113.1 315 90 P 3 62.16 18.36 18.54 0.00 -0.18 0.42 W 0.192 0.00 13.0 4 1.93XE
B073 PB EHZ -- A184.6 144 54 PD 3 72.02 28.22 28.42 0.00 -0.20 0.05 W 0.051 0.00 1.00 4