Errors from USGS Location and Magnitude:
EQPROC = 2.7km (1.7 mi)
HYPO2K = 3.9km (2.4 mi)
Magnitude = 0.1
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2025/12/20 04:10:00 37.749 -121.949 M2.9 8.1 4 km SE of San Ramon, CA
EQPROC Summary:
2865 2025Dec20 410 0.99 37.7733 -121.9509 4.21 0.03 24.0 57.5 160 6
RE9A7 EHZ AM 00 2025Dec20 410 9.70 P ?0 47.6 0.00
GLFBZ SHZ PN 01 2025Dec20 410 8.30 P ?3 40.6 -0.21
ADUB1 SHZ PN 01 2025Dec20 410 11.55 P ?0 58.5 0.00
B057 EHZ PB -- 2025Dec20 410 11.47 P ?3 61.1 -0.53
B058 EHZ PB -- 2025Dec20 410 20.12 Pg?3 113.0 0.00
B054 EHZ PB -- 2025Dec20 410 5.70 P U0 24.0 0.00
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2025-12-20 0410 1.42 37 46.902 121W57.273 4.20 0.02 0.55 8.38 2.79 2.79E 4.19
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 23.3 Emb 160 6 1 4 0 6 - 4 2.79 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
2.79 4 2.79 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
B054 PB EHZ -- A 23.3 293 95 PU 5.70 4.28 4.27 0.00 0.01 1.27 W 1.000 0.00 41.0 2.71 E
GLFBZPN SHZ 01 A 41.2 205 93 P 3 8.30 6.88 7.18 0.00 -0.30 0.00 W 0.000 0.00 43.0 2.86 E
RE9A7AM EHZ 00 A 48.0 98 92 P 9.70 8.28 8.28 0.00 0.00 1.27 W 1.000 0.00 3.00 4 0.30XE
ADUB1PN SHZ 01 A 59.3 183 92 P 11.55 10.13 10.13 0.00 0.00 1.27 W 1.000 0.00 109 1 3.78 E
B057 PB EHZ -- A 60.3 298 92 P 3 11.47 10.05 10.28 0.00 -0.23 0.19 W 0.999 0.00 31.0 2.57 E
B058 PB EHZ -- A113.9 162 91 P 3 20.12 18.70 19.02 0.00 -0.32 0.00 W 0.000 0.00 1.00 4