CLAR Site Information Form
     International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : Ken Hudnut
     Date Prepared            : 31-OCT-1997
     Report Type              : UPDATE
     Prepared Using           :


1.   Site Identification of the GPS Monument

     Site Name                : Claremont College
     Four Character ID        : CLAR
     Monument Inscription     : None
     IERS DOMES Number        : 49906M001
     CDP Number               : N/A
     Date Installed           : 05-APR-1995 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   : Monument is driven-rod braced type with 4 3/4"
                              : stainless rods to varied depths in a very coarse
                              : cobbled aluvium. Rods driven to refusal
                              : w/Whacker drill. Vertical datum is filed notch
                              : on vertical rod under antenna.
                              : SCIGN - Southern California Integrated GPS
                              : Network

2.   Site Location Information

     City or Town             : Claremont
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : Pacific-North America plate boundary
     Approximate Position
       X coordinate (m)       : -2458218.128
       Y coordinate (m)       : -4680467.721
       Z coordinate (m)       :  3556758.370
       Latitude (deg)         : ( dd.dddd N/S)
       Longitude (deg)        : (ddd.dddd E/W)
       Elevation (m)          : (m)
     Additional Information   : Approximate ITRF92 coordinates. Epoch 1995.25


3.   GPS Receiver Information

3.1  Receiver Type            : ASHTECH Low Power Z-XII Model 700845-6(1)
     Serial Number            : 04368 (USGS Property #G-615679)
     Firmware Version         : NAV 1E24, CHN 1C70
     Date Installed           : 05-APR-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : First Measurements

3.2  Receiver Type            : ASHTECH Low Power Z-XII Model 700845-6(1)
     Serial Number            : 04378 (USGS Property #G-615680)
     Firmware Version         : NAV 1E24, CHN 1C70
     Date Installed           : 18-APR-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Rx unit swapped (RAM upgrade)

3.3  Receiver Type            : ASHTECH Low Power Z-XII Model 700845-6(1)
     Serial Number            : 04378 (USGS Property #G-615680)
     Firmware Version         : NAV 1E24, CHN 1C70
     Date Installed           : 19-MAY-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : No changes to the rx unit at this time.

3.4  Receiver Type            : ASHTECH Low Power Z-XII Model 700845-6(1)
     Serial Number            : 04378 (USGS Property #G-615680)
     Firmware Version         : NAV 1E95, 1D01
     Date Installed           : 12-SEP-1996 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Firmware upgrade.

4.   GPS Antenna Information

4.1  Antenna Type             : ASHTECH L1/L2 P Model 700718-B (Large Ground Plane)
     Serial Number            : 10940
     Antenna Height (m)       : 0.1370
     Antenna Reference Point  : BPA
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 05-APR-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : First Measurements

4.2  Antenna Type             : ASHTECH L1/L2 P Model 700718-B (Large Ground Plane)
     Serial Number            : 10940
     Antenna Height (m)       : 0.1370
     Antenna Reference Point  : BPA
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 18-APR-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   :  No antenna changes at this time.

4.3  Antenna Type             : ASHTECH L1/L2 P Model 700936-A (Metal Choke Ring)
     Serial Number            : 11482
     Antenna Height (m)       : 0.1370
     Antenna Reference Point  : BPA/ARP
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 19-MAY-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : DM type antenna installed, old LGP antenna removed.
                              : NOTE: same filed notch used as vertical datum

4.4  Antenna Type             : ASHTECH L1/L2 P Model 700936-A (Metal Choke Ring)
     Serial Number            : 11482
     Antenna Height (m)       : 0.1370
     Antenna Reference Point  : BPA/ARP
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 12-SEP-1996 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : No changes to antenna at this time.

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        : dd-MMM-yyyy - 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                   : U.S. Geological Survey
                              : Office of Earthquakes, Volcanoes and
                              : Engineering
     Mailing Address          : U.S. Geological Survey
                              : 525 South Wilson Ave.
                              : Pasadena, CA 91106
     Primary Contact
       Contact Name           : Kenneth W. Hudnut
       Telephone (primary)    : (818) 583-7232
       Telephone (secondary)  :
       Fax                    : (818) 583-7827
       E-mail                 : hudnut@seismo.gps.caltech.edu
     Secondary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Additional Information   : (multiple lines)


10.  Responsible Agency (if different from 9.)

     Agency                   : (multiple lines)
     Mailing Address          : (multiple lines)
                              :
                              :
     Primary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Secondary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Additional Information   : (multiple lines)


11.  More Information

     URL for More Information :
     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: Metal Choke Ring Type

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


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

<--                      0.381                       -->
(                                                 NOTE: -0.1370 m ARP to vert. datum mark)


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering


NOTE: LGP removed on approx. May 19, 1995 (exchanged for ASHTECH DM type - see above)


               ASHTECH: GEODETIC L1/L2 P Large Ground Plane

                           ^
                 +-------------------+
+-+--+-+-------+-----------+-----------+--------+-+--+-+   <--  0.064 TGP=L1=L2
+-+--+-+------------+-------------+-------------+-+--+-+   <--  0.??? BGP
                    |-------------|
                    |-------------|
                    +-------------+                        <--  0.016 m
                         |---|                        (NOTE: 1.6 cm difference)
                         +-x-+                             <--  0.000 ARP=BPA
                                                      (NOTE: we use this!)

                  <--    0.080    -->                      (NOTE: -0.1370 m ARP to vert datum mark)
<--                      0.3474                      -->


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