Free-Air Gravity Map of Taiwan and Its Applications
An island-wide gravity in Taiwan was conducted by the Institute of Earth Sciences, Academia Sinica, between 1980 and 1987. The 603 stations at which the gravity values were determined included 308 points in the 500 m or higher mountain range where few readings were available previously. The average...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer
1990-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
| Subjects: | |
| Online Access: |
http://tao.cgu.org.tw/pdf/v12p143.pdf
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| _version_ | 1818013078842769408 |
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| author | Horng-Yuan Yen Yih-Hsiung Yeh Cheng-Horng Lin Guey-Kuen Yu Yi-Ben Tsai |
| author_facet | Horng-Yuan Yen Yih-Hsiung Yeh Cheng-Horng Lin Guey-Kuen Yu Yi-Ben Tsai |
| author_sort | Horng-Yuan Yen |
| collection | DOAJ |
| description | An island-wide gravity in Taiwan was conducted by the Institute of Earth Sciences, Academia Sinica, between 1980 and 1987. The 603 stations at which the gravity values were determined included 308 points in the 500 m or higher mountain range where few readings were available previously. The average spacing of the stations in the present survey is about 7 km apart. A new Free-air gravity anomaly map has been constructed based on these values. The map is dominated by a NNE-SSW gravity high trend with a maximum value of 300 mgal, that follows closely the Central Range, a folded and faulted mountain belt with many peaks 3000 m or higher. The magnitude of the Free-air anomaly in the Taiwan area is quite large compared to that elsewhere in the world. The good correlation between the Free-air anomaly and elevation suggests that the Taiwan area is not in isostatic equilibrium. An average surface rock density of 2.57 g cm-3 is estimated from the Free-air gravity data by using the least-squares method. This value can be used for both terrain and Bouguer corrections. The undulation of the geoid and the deflections of the vertical in the Taiwan area are also calculated by using the Free-air anomaly data. The geoid undulation is not rugged over the Taiwan area. The maximum difference is about 5 m. And the deflection of the vertical seems mainly to be affected by both land and submarine topographies. |
| first_indexed | 2024-04-14T06:28:53Z |
| format | Article |
| id | doaj.art-77367d7099ca4ef59de3ed17b332b572 |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-04-14T06:28:53Z |
| publishDate | 1990-01-01 |
| publisher | Springer |
| record_format | Article |
| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-77367d7099ca4ef59de3ed17b332b5722022-12-22T02:07:42ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76801990-01-011214310.3319/TAO.None(None)8Free-Air Gravity Map of Taiwan and Its ApplicationsHorng-Yuan YenYih-Hsiung YehCheng-Horng LinGuey-Kuen YuYi-Ben TsaiAn island-wide gravity in Taiwan was conducted by the Institute of Earth Sciences, Academia Sinica, between 1980 and 1987. The 603 stations at which the gravity values were determined included 308 points in the 500 m or higher mountain range where few readings were available previously. The average spacing of the stations in the present survey is about 7 km apart. A new Free-air gravity anomaly map has been constructed based on these values. The map is dominated by a NNE-SSW gravity high trend with a maximum value of 300 mgal, that follows closely the Central Range, a folded and faulted mountain belt with many peaks 3000 m or higher. The magnitude of the Free-air anomaly in the Taiwan area is quite large compared to that elsewhere in the world. The good correlation between the Free-air anomaly and elevation suggests that the Taiwan area is not in isostatic equilibrium. An average surface rock density of 2.57 g cm-3 is estimated from the Free-air gravity data by using the least-squares method. This value can be used for both terrain and Bouguer corrections. The undulation of the geoid and the deflections of the vertical in the Taiwan area are also calculated by using the Free-air anomaly data. The geoid undulation is not rugged over the Taiwan area. The maximum difference is about 5 m. And the deflection of the vertical seems mainly to be affected by both land and submarine topographies. http://tao.cgu.org.tw/pdf/v12p143.pdf geophysicsgeologyatmospheric sciencespace scienceoceanic sciencehydrology |
| spellingShingle | Horng-Yuan Yen Yih-Hsiung Yeh Cheng-Horng Lin Guey-Kuen Yu Yi-Ben Tsai Free-Air Gravity Map of Taiwan and Its Applications Terrestrial, Atmospheric and Oceanic Sciences geophysics geology atmospheric science space science oceanic science hydrology |
| title | Free-Air Gravity Map of Taiwan and Its Applications |
| title_full | Free-Air Gravity Map of Taiwan and Its Applications |
| title_fullStr | Free-Air Gravity Map of Taiwan and Its Applications |
| title_full_unstemmed | Free-Air Gravity Map of Taiwan and Its Applications |
| title_short | Free-Air Gravity Map of Taiwan and Its Applications |
| title_sort | free air gravity map of taiwan and its applications |
| topic | geophysics geology atmospheric science space science oceanic science hydrology |
| url |
http://tao.cgu.org.tw/pdf/v12p143.pdf
|
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