Event Number 2407

M2.6 m SSW of Ridgemark, CA - 2023/02/21 09:04:39 36.786 -121.376 M2.6 3.8 3km SSW of Ridgemark, CA at 2023/02/21 09:04:39 UTC / 2023/02/21 01:04:39 PDT

Error Map and Stations Used to Locate Event


   

   





Errors from USGS Location and Magnitude:

EQPROC = 14.4km (9.0 mi)

HYPO2K =  9.9km (6.2 mi)
Magnitude = -0.5


USGS Report:


Date       Time       Lat    Lon      Mag    Depth                Location   
-----------------------------------------------------------------------------------
2023/02/21 09:04:39  36.786 -121.376  M2.6   3.8 3km SSW of Ridgemark, CA



EQPROC Summary:


2407 2023Feb21  904 40.23  36.7194 -121.5146  6.50 0.05 10.7 75.3 177  6
ATZ   SHZ PN 01 2023Feb21  904 48.46 P D0  44.5   0.03
B058  EHZ PB -- 2023Feb21  904 42.78 P U0  10.6   0.01
MTUMZ SHZ PN 01 2023Feb21  904 50.56 P ?3  58.9  -0.30
ADUB1 SHZ PN 01 2023Feb21  904 52.48 P U3  71.6  -0.54
B073  EHZ PB -- 2023Feb21  905  0.72 P D3 125.9   0.04
B054  EHZ PB -- 2023Feb21  905  3.73 PgD3 140.4   0.57



HYPO2K Report:


 YEAR MO DA  --ORIGIN--  --LAT N-  --LON W--  DEPTH-M RMS   ERH   ERZ  XMAG1 FMAG1 PMAG GEOID-DEP
 2023-02-21  0904 40.12  36 43.751 121W27.313  2.35  0.04  2.18  7.83        3.11  3.11E    2.32
                                                                                          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  13.7  Emb  171   7   5   6   0   6      -                          4  3.11 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
                                                     3.11      4  3.11 E     32  4  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
 B058 PB EHZ -- A 13.7 305  91  PU    42.78  2.66  2.69 0.00 -0.03  2.00  W  1.000 0.00 37.0   2.55 E                        
 ATZ  PN SHZ 01 A 48.3 306  90  PD    48.46  8.34  8.31 0.00  0.03  2.00  W  0.986 0.00 98.0   3.66 E                        
 MTUMZPN SHZ 01 A 61.4 321  90  P  3  50.56 10.44 10.45 0.00 -0.01  0.50  W  0.195 0.00 19.0   2.10 E                        
 ADUB1PN SHZ 01 A 74.1 322  90  PU 3  52.48 12.36 12.52 0.00 -0.16  0.50  W  0.219 0.00 53.0   3.10 E                        
 B073 PB EHZ -- A123.8 134  90  PD 3  60.72 20.60 20.60 0.00 -0.00  0.50  W  0.999 0.00 1.00 4                               
 B054 PB EHZ -- A141.8 333  90  PD 3  63.73 23.61 23.53 0.00  0.08  0.50  W  0.599 0.00 1.00 4