1 Center for Measurement Standards(CMS)-National Measurement Laboratory(NML) 2 Department of Civil Engineering,

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Presentation transcript:

1 Center for Measurement Standards(CMS)-National Measurement Laboratory(NML) 2 Department of Civil Engineering, National Chiao Tung University(NCTU), 3 Ministry of the Interior (MOI), Taiwan ) Results of Absolute Gravimeter Measurements in Taiwan Chiung-Wu Lee 1, Ge-Fu Hwang 2,3, Hui-Chin Yu 1, and Cheinway Hwang 2 ICAG Workshop Sep BIPM, Paris

Abs. Gravimetry in Taiwan Using FG5 224

Results of observed gravity B12 at CMS Date μGal Std. error: 3.4 μGal

Uncertainty Evaluation The expanded uncertainty U e = k c u c k c =2.0, 95% level of confidence, u c = 3.2 μμGal, U e = 2.0 × 3.2μGal = 6.4μGal

Abs. gravity survey( Ⅰ ) Taiwan

Summary of FG5 observations LocationTime span Mean gravity( μ Gal) Mean Standard error( μ Gal) Kenting 2004/2/5 – 2/6 (43 hours) Mt. Yangming 2004/2/8 – 2/10 (63.5 hours) Hsinchu 2004/2/11-2/12 (48 hours)

Comparison of NCTU and FG5 solid earth tide effects at Hsinchu

Comparison of NCTU and FG5 ocean loading effects at Hsinchu

Modeling solid earth tide and ocean loading effects

Land Subsidence Determination

summary of FG5 observations ( unit ： μ Gal )

Abs. gravity survey( Ⅱ ) Simultaneous and continuous gravity, GPS and sea level observations were made at Mazu, Kinmen, Penghu, Lanyu and Hsinchu for at least 3 days GPS, gravity and tide stations are either co-located or separated by a short distance Taiwan Mainland China

FG5 S/N 224 was used 50 drops a set, 30-minute set interval, 48 sets a day All environmental corrections, except ocean loading effect, were made The Sumatra earthquake occurred while measuring gravity at Lanyu Absolute gravity measurements

Date μGal Data of Lanyu

Amplitude and phase of M2 tide Observed 3.7 m,-31º 2.2 m, 58º 2.7 m, 7º 0.9 m,-2º 0.8 m,-133º The M2 wave propagates to China Seas from the Pacific Ocean Mainland China Taiwan

The amplitudes of M2 wave from gravity and GPS observation are larger than those from modeled results The characteristics of ocean loading effect along the southeast China coasts and Taiwan Strait are different from those in the Pacific Ocean east of Taiwan Amplitude and phase of M2 gravity Observed and Modeled

Joint MOI-Kyoto Measurement

Results from CMS and IAGB-KYOTO

Metrology

Superconducting Gravimeter

ICAG-2005 e_mail ： Chinese Taipei Taiwan Thank You