Errors from USGS Location and Magnitude:
EQPROC = 6.3km (3.9 mi)
HYPO2K = 5.2km (3.2 mi)
Magnitude = 0.2
USGS Report:
Date Time Lat Lon Mag Depth Location
-----------------------------------------------------------------------------------
2026/08/17 08:18:41 37.949 -121.996 M2.6 14.6 3 km SE of Concord, CA
EQPROC Summary:
3004 2026Aug17 818 42.73 37.9823 -122.0535 10.19 0.16 18.7 71.6 201 7
GLFBZ SHZ PN 01 2026Aug17 818 54.28 P ?1 60.3 0.63
RE9A7 EHZ AM 00 2026Aug17 818 54.12 P ?1 63.5 -0.00
ADUB1 SHZ PN 01 2026Aug17 818 56.66 P U0 81.9 -0.14
MTUMZ SHZ PN 01 2026Aug17 818 57.13 P D3 93.1 -1.31
B057 EHZ PB -- 2026Aug17 818 51.17 P U0 45.5 0.00
B054 EHZ PB -- 2026Aug17 818 46.76 P U0 18.7 -0.02
B058 EHZ PB -- 2026Aug17 819 3.42 PnU3 137.9 -0.88
HYPO2K Report:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH-M RMS ERH ERZ XMAG1 FMAG1 PMAG GEOID-DEP
2026-08-17 0818 43.29 37 57.255 122W 3.979 11.22 0.03 0.71 1.71 2.36 2.36E 11.21
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 15.7 Emb 193 10 5 4 0 7 5 0.20 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
2.36 5 0.20 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 15.7 229 122 PU 46.76 3.47 3.47 0.00 -0.00 1.32 W 0.999 0.00 29.0 2.35 E
B057 PB EHZ -- A 44.6 281 102 PU 51.17 7.88 7.88 0.00 -0.00 1.32 W 0.999 0.00 25.0 2.36 E
GLFBZPN SHZ 01 A 57.0 188 99 P 1 54.28 10.99 9.87 0.00 1.12* 0.06 W 0.001 0.00 15.0 1.88 E
RE9A7AM EHZ 00 A 63.0 114 98 P 1 54.12 10.83 10.83 0.00 -0.00 0.99 W 0.999 0.00 30.0 2 2.56 E
ADUB1PN SHZ 01 A 78.8 174 96 PU 56.66 13.37 13.38 0.00 -0.01 1.32 W 0.998 0.00 45.0 2.96 E
MTUMZPN SHZ 01 A 90.2 170 95 PD 3 57.13 13.84 15.21 0.00 -1.37* 0.00 W 0.000 0.00 9.00 4 1.42XE
B058 PB EHZ -- A135.2 161 66 PU 3 63.42 20.13 22.39 0.00 -2.26* 0.00 W 0.000 0.00 1.00 4