Errors from USGS Location and Magnitude:
EQPROC = 7.3km (4.5 mi)
HYPO2K = 9.5km (5.9 mi)
Magnitude = 0.1
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2025/12/20 03:56:09 37.748 -121.942 M3.8 9.9 5 km SE of San Ramon, CA
EQPROC Summary:
2864 2025Dec20 356 10.97 37.7293 -122.0215 7.63 0.12 21.4 55.9 139 9
LCGPZ SHZ PN 01 2025Dec20 356 17.34 P ?3 32.3 0.21
GLFBZ SHZ PN 01 2025Dec20 356 17.36 P D0 33.6 -0.00
RE9A7 EHZ AM 00 2025Dec20 356 19.76 P D3 53.4 -0.93
ADUB1 SHZ PN 01 2025Dec20 356 20.74 P D0 53.7 -0.00
ATZ SHZ PN 01 2025Dec20 356 25.59 P ?0 84.2 -0.00
B058 EHZ PB -- 2025Dec20 356 28.25 PnD2 110.4 -1.07
B054 EHZ PB -- 2025Dec20 356 15.32 P U0 21.4 -0.00
B057 EHZ PB -- 2025Dec20 356 21.06 P U0 58.3 -0.47
B073 EHZ PB -- 2025Dec20 356 46.70 PnU3 240.7 0.78
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2025-12-20 0356 11.33 37 43.849 122W 2.852 10.79 0.02 1.55 2.30 3.69 3.69E 10.78
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
9 9 19.6 Emb 212 11 7 5 0 9 7 2.36 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 7 2.36 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 19.6 318 115 PU 15.32 3.99 3.99 0.00 -0.00 1.19 W 0.993 0.00 101 3.57 E
LCGPZPN SHZ 01 A 31.1 214 106 P 3 17.34 6.01 5.73 0.00 0.28 0.04 W 0.002 0.00 121 3.81 E
GLFBZPN SHZ 01 A 33.0 197 105 PD 17.36 6.03 6.04 0.00 -0.01 1.19 W 0.977 0.00 97.0 3.61 E
ADUB1PN SHZ 01 A 54.0 173 99 PD 20.74 9.41 9.37 0.00 0.04 1.19 W 0.425 0.00 217 1 4.45 E
RE9A7AM EHZ 00 A 55.6 91 99 PD 3 19.76 8.43 9.63 0.00 -1.20* 0.00 W 0.000 0.00 59.0 4 3.19XE
B057 PB EHZ -- A 56.2 306 99 PU 21.06 9.73 9.72 0.00 0.01 1.19 W 0.991 0.00 79.0 1 3.48 E
ATZ PN SHZ 01 A 84.6 170 96 P 25.59 14.26 14.29 0.00 -0.03 1.19 W 0.610 0.00 300 4.79 E
B058 PB EHZ -- A111.3 158 94 PD 2 28.25 16.92 18.63 0.00 -1.71* 0.00 W 0.000 0.00 75.0 3.49 E
B073 PB EHZ -- A242.8 144 48 PU 3 46.70 35.37 36.55 0.00 -1.18* 0.00 W 0.000 0.00 1.00 4