Truk Atoll (Carolines, Micronesia) Site History
History Summary
Station | Truk |
---|---|
Country | Fed. States Micronesia |
Latitude | 07° 27.0' N |
Longitude | 151° 51.0' E |
GLOSS No | 116 |
Time Reference | GMT (hours 00-23) |
Contributors | National Ocean Service (NOS)
National Ocean. and Atmos. Administration (NOAA) |
Instrument Type | Standard mechanical (1947-1974)
Analog-to-digital (ADR) recorder (1975-1990) Aquatrak acoustic gauge, NOAA Next Generation Water Level Measuring System (NGWLMS) (1991-) |
Site of Gauge | The gauge is situated outside the public works, directly opposite Gout Pier. |
Observational periods | 1947 - 1991 |
Reference Level
All heights have been referred to the station tide staff zero which is linked to fixed benchmarks. Differences with PSMSL data suggest level uncertainty prior to 1963.
Tide Gauge Benchmark (TGBM) Description
Benchmark B (1948) is the primary benchmark and is stamped 'B 1948'. It is set into the concrete pavement along the north side of a row of 6 Quonset warehouses, east of the government pier.
Five additional benchmarks are levelled to the TGBM and tide station on a yearly basis.
Datum Levels
The Tide Gauge Benchmark is 8.05 feet above the Tide Gauge Zero (Station Datum). NOAA Chart Datum is 2.73 feet above Station Datum and the mean sea level (1960-1978) is 3.58 feet above Station Datum.
Quality Assessment
Comments
The daily and monthly means reveal no apparent reference level changes or trends.
The timing appears to be off by roughly 6 minutes from September - January 1992.
A datum shift of -0.65m has been corrected during the period 31/05/94(1700)-31/05/94(2300).
Notable episodic events:
- 09-10 Mar 1957: Tsunami from C. Aleutians
- 23-25 May 1960: Tsunami from S.C. Chile
- 28 Mar 1964: Tsunami from Alaska
Year | CI(%) | Missing Data | Replaced Gaps or bad Data | Questionable Fluctuations |
---|---|---|---|---|
1948 | 50 | 1-9,116-277,289-293,295-299,361-366 | (09)282-(23)282 (11)080-(23)080 | 336,353-356 |
1949 | 34 | 1-83,121-273,337-340,357-360,363-365 | (01)336-(00)337 (13)341-(21)341 (11)360-(02)361 (11)361-(02)362 (07)362-(02)363 | none |
1950 | 92 | 1-7,16-17,181-184,200-202,207-212,220-222,225-229,236-238,242-243,266-267,285-289 | (16)025-(05)026 (19)124-(02)125 (15)184-(08)185 (15)187-(07)188 (17)188-(01)189 (23)192-(08)193 (01)198-(08)198 (10)198-(03)199 (15)204-(03)205 (15)212-(23)212 (14)224-(21)224 (23)268-(07)269 (22)270-(08)271 (23)273-(23)273 (17)281-(13)282 (13)284-(07)285 | 146-148 |
1951 | 60 | 155-303 | (23)051-(06)052 (14)084-(13)085 (21)119-(06)120 (21)120-(23)120 (22)121-(05)122 | none |
1952 | 35 | 9-243,259-261,266-268 | (17)335-(23)335 | none |
1953 | 100 | none | (14)089-(13)090 (14)134-(13)135 (14)223-(13)224 (04)313-(20)313 | none |
1954 | 100 | none | (08)167-(01)168 | none |
1955 | 34 | 126-365 | none | none |
1956 | 91 | 1-36 | none | none |
1957 | 100 | none | none | none |
1958 | 92 | 336-365 | none | none |
1959 | 100 | none | none | none |
1960 | 88 | 20-65 | none | none |
1961 | 100 | none | none | none |
1962 | 100 | none | (00)330-(18)330 | none |
1963 | 100 | none | none | none |
1964 | 100 | none | none | none |
1965 | 100 | none | none | none |
1966 | 100 | none | none | none |
1967 | 92 | 181-212 | none | none |
1968 | 100 | none | none | none |
1969 | 100 | none | none | none |
1970 | 100 | none | none | none |
1971 | 100 | none | (15)274-(23)274 (18)349-(10)350 | none |
1972 | 99 | 161-163 | (00)174-(22)174 | none |
1973 | 100 | none | (02)226-(17)226 (23)227-(09)228 (12)231-(20)231 (07)309-(21)309 (15)326-(22)326 | none |
1974 | 100 | none | (22)347-(09)348 (22)348-(12)349 (14)365-(23)365 | none |
1975 | 83 | 304-365 | none | 59-60 |
1976 | 75 | 25-48,63-69,72-83,121-122,251-297,360-362 | (05)251-(13)251 | none |
1977 | 91 | 8-9,11-30,49-52,82-92 | none | none |
1978 | 94 | 10-12,66-69,92-93,274-287,348-349 | (06)046-(05)047 (01)100-(23)100 (10)106-(21)106 | none |
1979 | 99 | 37-39,102-105,119-121 | none | 146 |
1980 | 100 | none | none | none |
1981 | 94 | 222-243 | none | none |
1982 | 100 | none | none | none |
1983 | 100 | none | none | none |
1984 | 100 | 335-336 | none | none |
1985 | 100 | none | none | none |
1986 | 100 | 212 | none | 60-63 |
1987 | 78 | 259-266,276-278 | none | 272,274-275 |
1988 | 86 | none | none | none |
1989 | 100 | none | none | none |
1990 | 90 | none | none | none |
1991 | 91 | 107-127,199-222,245-246 | none | See comment above |
1992 | 7 | 27-366 | none | See comment above |
1993 | 9 | 1-333 | none | none |
1994 | 100 | none | none | none |
1995 | 56 | 205-365 | none | none |