Errors from USGS Location and Magnitude:
EQPROC = 3.7km (2.3 mi)
HYPO2K = 4.5km (2.8 mi)
Magnitude = 0.1
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2025/12/20 03:49:22 37.749 -121.938 M3.8 9.3 5 km SE of San Ramon, CA
EQPROC Summary:
2863 2025Dec20 349 23.60 37.7425 -121.9796 3.00 0.11 23.4 60.1 149 9
GLFBZ SHZ PN 01 2025Dec20 349 30.50 P ?1 36.4 -0.00
RE9A7 EHZ AM 00 2025Dec20 349 32.77 P ?1 49.8 -0.00
ADUB1 SHZ PN 01 2025Dec20 349 33.89 P ?3 55.0 0.23
LCGPZ SHZ PN 01 2025Dec20 349 35.82 S D2 35.7 0.54
ATZ SHZ PN 01 2025Dec20 349 38.81 P D1 85.2 0.03
B057 EHZ PB -- 2025Dec20 349 34.05 P U0 60.6 -0.56
B054 EHZ PB -- 2025Dec20 349 28.30 P U0 23.4 -0.00
B058 EHZ PB -- 2025Dec20 349 41.99 P D3 110.5 -0.54
B073 EHZ PB -- 2025Dec20 350 4.76 PgD3 239.8 3.35
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2025-12-20 0349 23.91 37 45.297 121W59.340 0.80 0.14 0.86 13.34 3.69 3.69E 0.79
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
8 8 21.9 Emb 151 6 5 6 0 8 - 5 0.47 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
3.69 5 0.47 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 21.9 303 27 PU 28.30 4.39 4.24 0.00 0.15 1.33 W 0.997 0.00 103 3.59 E
GLFBZPN SHZ 01 A 37.3 203 27 P 1 30.50 6.59 6.74 0.00 -0.15 1.00 W 0.530 0.00 103 1 3.69 E
RE9A7AM EHZ 00 A 50.6 94 27 P 1 32.77 8.86 8.91 0.00 -0.05 1.00 W 0.957 0.00 85.0 4 3.53XE
ADUB1PN SHZ 01 A 56.3 179 27 P 3 33.89 9.98 9.84 0.00 0.14 0.33 W 0.053 0.00 190 4.31 E
B057 PB EHZ -- A 59.0 301 27 PU 34.05 10.14 10.28 0.00 -0.14 1.33 W 0.995 0.00 89.0 3.58 E
ATZ PN SHZ 01 A 86.6 174 27 PD 1 38.81 14.90 14.76 0.00 0.14 1.00 W 0.465 0.00 332 2 4.88 E
B058 PB EHZ -- A112.0 161 27 PD 3 41.99 18.08 18.90 0.00 -0.82* 0.00 W 0.000 0.00 1.00 4
B073 PB EHZ -- A242.0 145 20 PD 3 64.76 40.85 37.66 0.00 3.19* 0.00 W 0.000 0.00 1.00 4