Site Number: 871
Current Site Name: CHICHI JIMA
Other Site Name: TITISIMA
Location: OGASAWARA, BONIN ISLANDS, JAPAN
Geographic Region: PACIFIC
Tectonic Plate: PHILIPPINE
Primary Scientific Purposes: MEASUREMENT OF THE THREE DIMENSIONAL GEODETIC PORTION OF THE ISLAND BY THE SIMULTANEOUS LASER OBSERVATION WITH THE SIMO- SATO HYDROGRAPHIC OBSERVATORY (SHO). THE OBSERVATION WAS CARRIED OUT FROM JAN. TO MAY 1988, BY USING THE HTLRS. MEASUREMENTS SUPPORTING THE DETERMINATION OF PLATE MOTION.
Site Description: TITI SIMA OF THE OGASAWARA (BONIN) ISLANDS LIES ABOUT 980 KM SOUTH OF TOKOYO. THE NTT RELAY STATION IS LOCATED ABOUT 2 KM EAST OF THE FUTAMI HARBOR. A STONE MARKER IS ESTABLISHED IN THE NTT STATION. A METAL MARK WAS PLACED IN THE CONCRETE BASEMENT FOR THE TRANSPORTABLE ANTENNA OF THE GEOGRAPHICAL SURVEY INSTITUTE (GSI). THE SITE WAS OCCUPIED BY THE ANTENNA IN 1987 AND 1989. ALTHOUGH THE ANTENNA HAS BEEN REMOVED, REOCCUPATION IS ALWAYS POSSIBLE. A GPS CIGNET SITE IS OPERATING NEXT TO THIS SITE.
Site Topo Map: CHICHIJIMA (NO. NG-54-8-14-1.2) OF THE 1:25,000 TOPO MAP SERIES OF THE GEOGRAPHICAL SURVEY INSTITUTE (GSI) OF JAPAN.
Geological Province: OGASAWARA RIDGE
Local Geology: PALAEOGENE ANDESITE AND TUFF BRECCIA
Comments: THIS IS AN SLR/VLBI COLOCATION SITE
Site Number: 871
Current Site Name: CHICHI JIMA
Location: OGASAWARA, BONIN ISLANDS, JAPAN
Number of Observing Monuments: 2
Surveyed into National Network? YES
Monument Number: 7316
Type of Monument: INTERSECTION OF AZ/EL AXES
Monument Inscription: NONE
Systems Using Monument: 5-METER TRANSPORTABLE ANTENNA
Latitude: N 27 05' 41.522"
Longitude: E 142 11' 28.995"
Elevation: 48.920 meters
Height Above Ellipsoid: meters
Survey Source/Date: GEOGRAPHICAL SURVEY INSTITUTE / 01-AUG-87
Datum/Ellipsoid: TOKYO
Comments: A= 6377397.155 F= 1/299.152813
Differential Coordinates FROM Observing Monument 7316 TO Reference Monuments and Other Observing Monuments
Data Source:
Mon. Number Monument Inscription X Y Z -- VLBI MARKER 2.828 -2.194 -1.831
Mon. Number Monument Inscription North East Up
Site Number: 871
Current Site Name: CHICHI JIMA
Location: OGASAWARA, BONIN ISLANDS, JAPAN
Monument Number: 7844
Type of Monument: FIDUCIAL STONE MARKER
Monument Inscription: NONE
Systems Using Monument: HTLRS
Latitude: N 27 O5' 20.065"
Longitude: E 142 12' 49.139"
Elevation: 211.080 meters
Height Above Ellipsoid: meters
Survey Source/Date: HYDROGRAPHIC DEPARTMENT / 01-FEB-88
Datum/Ellipsoid: LOCAL/ BESSEL
Comments: NONE
Differential Coordinates FROM Observing Monument 7844 TO Reference Monuments and Other Observing Monuments
Data Source: HYDROGRAPHIC OBSERVATIONS,
Mon. Number Monument Inscription X Y Z -- YOAKEYAMA 2064.058 1644.702 1037.647
Mon. Number Monument Inscription North East Up
Site Number: 871
Current Site Name: CHICHI JIMA
Location: OGASAWARA, BONIN ISLANDS, JAPAN
Monument Occupying Occupation Starting Ending Number System Designator Date Date 7844 HTLRS-1 78441701 01-JAN-88 13-MAR-88
Monument Occupying Occupation Starting Ending Number System Designator Date Date 7844 JMV 78444401 18-NOV-87 25-NOV-87 7844 JMV 78444402 28-NOV-89 29-NOV-89