USGS Professonal Paper 1096 - IRIS

CALIFORNIA--Continued
Menlo Park, CA
INSTRUMENTATION
_Seismometer Galvo Type Magnification
Code "",e Component Io(sec) Ig(sec) recordjng at T 0
Remarks
Most stations Mark L-4C------- Z 1.0 --- Develocorder --- A few stations .re
also recorded on
HdiC9I'lhl£
~g:: :-:g~: ~~g~:
~
(OBID) , (OCOX),
(ODAM) , (OFIG) ,
(OLW) • OTBH, SRC,
and STC: Mark L-4C------- Z,NS 1.0 --- --do-------- --- ---
AFDM Geotech S-13---- Z,NS,EW 1.0 --- --do-------- --- ---
BVLM, CRC, (OLON)
and OWYM: Mark L-4C------- Z,NS,EW 1.0 --- --do-------- --- ---
JBMM Hark L-4C------- Z 1.0 --- --do-------- --- ---
Wilmore--------- NS 5.0 --- --do-------- --- Operated only
April-August 1975.
Timing system:
WWVB and IRIG signals recorded directly.
System response curves: See figure 2, p. 363,
SHORT HISTORY
Coding of these stations i, somewhat unusual. Local codes had been assigned that often conflicted with other international
codes; therefore, when data were contributed to NElS, alternate three-letter codes were assigned. To identify the networks 'nd
to obtaln unlque statlon names that would not conflict with existing codes,
•
system of four-letter codes was designed.
are the codes ending with H, listed in the column headed "New."
These
The "Alternate" codes .,. those which were assigned by NElS and
,,. still valid. The "Local" codes are those which had been used by Henlo Park in cataloging data and which may still be useful
in locating old records.
The first letter of the four-letter codes signifies the network that contains the station.
Therefore, A--M belongs to the network Auburn
B--H
Bear Valley
C--H
Calaveras
GuM
Geysers
H--H
Holister
J--M
San Jose
L--M
Lassen
H--M
Helones
N--H
Napa
O--H
Orovi lle
P--H
Parkfield
The Coso network does not conform to this system. Its members include BCIDi, CBIDi, CHIM, CGSH, CPTH, CSSH, DKNM, DTEH,
IIWSH, OR,,", HFSM, NHCM, RCWM, RVCM, SMWM, VPEH.
Recording of seismiCity near Auburn began in february 1972, with the installation of the station ADC; it i, owned by the
Bureau of Reclamation and operated by the USGS, Albuquerque. A horizontal Wood-Anderson began operating there in April 1973.
On January 28, 1976. the operation of the station was turned over to USGS, Henlo Park, which expanded the network to include
:26 stations.
HORM was not operated from May 9, 1968, to December 3, 1969.
JPPI1 was not operated from April 5. 1971, to August 20, 1975.
JBCM, (LHD) , (MDO) , NFII1, CSHM, (FOR) • and HeR" operate intermittently.
The Center publishes a quaterly report entitled, "Catalog of Earthquakes along the San Andreas Fault system in Central
CahforDl_a.
73