Rabaul (Papua New Guinea) Site History

Site

Station Rabaul
Country Papua New Guinea
Latitude 04° 12.0' S
Longitude 152° 10.5' E
GLOSS No 065
Time Reference GMT (hours 00-23)
Contributors University of Hawaii Sea Level Center
Flinders University of South Australia (1966-1971 data)
Instrument Type     (1966-71 unconfirmed)
1. (1974-present) Leupold and Stevens Analog-to-Digital Recorder (ADR)
2. (10/1984-present) Handar Encoder (ENC)
Primary gauge ADR:1974-90
ENC 1991-
Site of Gauge The gauge is situated just off the main wharf.
Observational periods 1966 - present

Reference Level

All heights have been referred to the station tide staff zero which is linked to fixed bench marks.

Benchmarks

BM RL 303 A Department of Lands and Survey brass plate, with a pin, stamped 'RL No 303' is located at the north east corner of the old copra, north of Wreck Wharf, 300 yards from the tide gauge.
BM RL 431 A Department of Lands and Survey brass plate, with a pin, stamped 'RL No 431', is located at the corner of Malaguna Road and Coastwatchers Road, on the north west side of centre island along top of the curbing.
UH-1 A stainless steel disc 1.25 inches in diameter set in white epoxy, was established by the Oceanography Dept., University of Hawaii. It is situated 4 feet north of the tide staff, at centre of the curb, on Main Wharf.
US C&GS BM 1 A standard brass US C&GS benchmark, marked 'No.1 1948', is set in the top of a low stone wall at the seaward end of Namanula Street.
Moresby BM The centre of a standard RAN hydrographic branch circular brass triangulation plate, marked 'HMAS Moresby 1941', is set into a stone seawall by the swimming pool at the seaward end of Namanula St.

Datum Levels

Tide Gauge Zero (TGZ) 2.996m
US C&GS BM 1 3.057m
(Chart Datum)
Moresby 1941 1.503m
(Chart Datum)

Datum of data is tide gauge zero.

NOTE: Rabaul is located in a seismically active region.

Quality Assessment by the UH Sea Level Centre

Comment

The daily and monthly means reveal no apparent changes in the reference level and agree with Kapingamarangi.

A volcanic eruption on 30 September, 1994 resulted in heavy subsidence until October 1. Based on geodetic leveling information provided by local authorities, -13 cm were added to the October 1994 data and -14 were added to the November 1994 data.

A spike on 17 February 1996 is associated with a tsunami.

Year CI(%) Missing Data Replaced Gaps or Bad Data Questionable Fluctuations
1966 74 none none 357-359
1967 100 none (02)326-(10)326 (02)327-(09)327 (01)329-(12)329 (02)332-(12)332 (19)333-(08)334 (01)335-(08)335 (22)335-(09)336(23)336-(09)337 50-53,213-217
1968 85 89-145 none none
1969 73 23-28,71-77,102-121,167-178,194-212,278-306,350-364 (18)310-(05)311 none
1970 40 12-18,46-153,196-289,320-331,359-364 none none
1971 28 104-365 none none
1972 0 1-366 none none
1973 0 1-365 none none
1974 6 none none none
1975 100 none none none
1976 100 none none none
1977 97 61-63,199-206 (11)059-(05)060 none
1978 97 21-23,99-108 (14)365-(23)365 none
1979 100 none none none
1980 100 none none none
1981 95 178-180,204-208,211-218,334-335 none none
1982 98 29-34,37-39 none none
1983 100 none none none
1984 100 none none none
1985 100 none none none
1986 100 none none none
1987 100 none none none
1988 100 none none none
1989 100 none none none
1990 100 none none none
1991 100 none none none
1992 100 none none none
1993 100 none none none
1994 97 262-275 none none
1995 100 none none none
1996 100 none (10)363-(02)364 (10)364-(03)365 none
1997 99 011-014 (06)005-(19)005 none