COSO Site Information Form
     International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : Jeff Behr
     Date Prepared            : 13-MAY-1997
     Report Type              : UPDATE
     Prepared Using           :


1.   Site Identification of the GPS Monument

     Site Name                : China Lake (SCIGN/PGGA)
     Four Character ID        : COSO
     Monument Inscription     : None
                              : 3/4" diameter, vertical stainless steel rod
                              : embedded in outcrop of granitic basement.
                              : Antenna height measured from top of 1"
                              : diameter ring welded to 3/4" rod.
     IERS DOMES Number        : 40469M001
     CDP Number               : (XXXX)
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Geologic Characteristic  : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc)
       Bedrock Type           : (IGNEOUS/METAMORPHIC/SEDIMENTARY)
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (1-10 cm/10-50 cm/50-200 cm/over 200 cm)
       Notes                  : (multiple lines)
     Additional Information   : SCIGN - Southern California Integrated GPS
                              : Network
                              : PGGA - Permanent GPS Geodetic Array


2.   Site Location Information

     City or Town             : North of Ridgecrest,Inyo County,
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : North American plate
     Approximate Position
       X coordinate (m)       : -2411148.2270
       Y coordinate (m)       : -4571430.4858
       Z coordinate (m)       : 3727461.5568
       Latitude (deg)         :   35.9823
       Longitude (deg)        : -117.8089
       Elevation (m)          : 1456.3884
     Additional Information   : (multiple lines)


3.   GPS Receiver Information

3.1  Receiver Type            : ASHTECH Z-XII3 (Z12) Model 700570-6
     Serial Number            : 03233 (Loaner II-93)
     Firmware Version         : NAV 1E00, CHN 1C50
     Date Installed           : 16-AUG-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : : First measurements

3.x  Receiver Type            :
     Serial Number            :
     Firmware Version         :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


4.   GPS Antenna Information

4.1  Antenna Type             : ASHTECH L1/L2 P Model 700228-B (Rev. B)
     Serial Number            : B1163
     Antenna Height (m)       : 0.0663
     Antenna Reference Point  : BPA
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 16-AUG-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

4.2  Antenna Type             : ASHTECH Choke Ring Model 700936 (Rev. D)
     Serial Number            : 12660
     Antenna Height (m)       : 0.0625
     Antenna Reference Point  : BPA
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 29-APR-1996 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Direct height measurement from top of SS
                              : collar on threaded rod to pre-amp base.


4.x  Antenna Type             :
     Serial Number            :
     Antenna Height (m)       : (m)
     Antenna Reference Point  : (ARP/BCR/BPA)
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


5.   Local Site Ties

5.x  Monument Name            :
     Site Ref CDP Number      : (XXXX)
     Site Ref Domes Number    : (XXXXXXXXX)
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (m)
     Accuracy (mm)            : (mm)
     Date Measured            : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Frequency              :
       Effective Dates        : 16-AUG-1995 - dd-MMM-yyyy)
       Notes                  : (multiple lines)

6.x  Standard Type            : (H-MASER/CESIUM/QUARTZ/INTERNAL/RUBIDIUM)
       Frequency              :
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)


7.   Collocation Information

7.x  Instrumentation Type     : (DORIS/GLONASS/PRARE/SLR/VLBI)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)


8.   Meteorological Instrumentation

8.1  Humidity Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (% rel h)     : (% rel h)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.2  Pressure Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (mbar)        : (mbar)
       Height Diff to GPS (m) : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.3  Temperature Sensor Model :
       Manufacturer           :
       Data Frequency         :
       Accuracy (deg C)       : (deg C)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.4  Water Vapor Radiometer   :
       Manufacturer           :
       Distance to GPS (m)    : (m)
       Elev Diff to GPS (m)   : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.5  Other Instrumentation    : (multiple lines)


9.   On-Site, Point of Contact Agency Information

     Agency                   : Geothermal Program Office
                              : Naval Air Weapons Station - China Lake
     Mailing Address          : Geothermal Program Office (8236000)
                              : Naval Air Weapons Station
                              : China Lake, CA 93555
     Primary Contact
       Contact Name           : Steven Bjornstad
       Telephone (primary)    : (619) 939-4048
       Telephone (secondary)  :
       Fax                    : (619) 939-2449
       E-mail                 : Steven_Bjornstad@imdgw.ChinaLake.Navy.MIL
     Secondary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Additional Information   : (multiple lines)


10.  Responsible Agency (if different from 9.)

     Agency                   : Scripps Institution of Oceanography
     Mailing Address          : IGPP 0225, Scripps Institution of
                              : Oceanography
                              : 9500 Gilman Drive, La Jolla, CA 92093-0225
     Primary Contact
       Contact Name           : Jeff Dean
       Telephone (primary)    : (619) 534-7692
       Telephone (secondary)  :
       Fax                    : (619) 534-9873
       E-mail                 : jdean@pgga.ucsd.edu
     Secondary Contact
       Contact Name           : Chris Roelle
       Telephone (primary)    : (619) 534-7692
       Telephone (secondary)  :
       Fax                    : (619) 534-9873
       E-mail                 : roelle@pgga.ucsd.edu
     Additional Information   : (multiple lines)


11.  More Information

     URL for More Information : http://lox.ucsd.edu
     Hardcopy on File
       Site Map               : (Y)
       Site Diagram           : (Y)
       Horizon Mask           : (Y)
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions


            ASHTECH: GEODETIC L1/L2 L

                           ^
                 +-------------------+
  +--+ +-------+-----------+-----------+--------+ +--+   <--  0.064  TGP=L1=L2
+-+--+ +------------+-------------+-------------+ +--+-+ <--  0.060  BGP
                    |-------------|
                    |-------------|
                    |-------------|
                    |-------------|
                    +------x------+                      <--  0.000  ARP=BPA

                  <--    0.080    -->
      <--                0.220                 -->
<--                      0.286                       -->


      ASHTECH w/DORNE MARGOLIN Choke Ring (& Radome)

                         -----
                     /     +     \                        <-- 0.128  L2
                    |      +      |                       <-- 0.110  L1
  +--------------------------------------------------+    <-- 0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.038  BCR
+-------------------+-------------+--------------------+  <-- 0.035  BGP
                    |             |
                   =|             |
                    +------x------+                       <-- 0.000  m ARP

<--                      0.381                       -->


     NOTE: Dimensions and Offsets Presumed to be same
           as for TURBOROGUE DM-T (tests pending)

   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering
   TGP: Top of Ground Plane               BGP: Bottom of Ground Plane
   TPA: Top of Preamplifier               BPA: Bottom of Preamplifier