Geomagnetic Investigations in the Pingtung Plain, Taiwan

                                               Tai-Yun Liu

                                     Abstract

                  The Pingtung plain is covered by sands and gravels of recent alluvial
                deposits, while Neogene rocks are distributed around the border of the
                plain. In the Pingtung plain, the detailed gravity survey and magnetic
                survey were carried out respectively in the past. Combining the
                geophysical data with geologic information, the subsurface structures of
                the plain were inferred. The residual magnetic anomalies with different
                amplitude have two prominent features, which maybe caused by local
                variation of magnetic susceptibility, cultural disturbances, or due to
                deeper basement rocks. Comparing first-degree trend surface and IGRF
                contours with total intensity, the former is more suitable for representing
                the regional field. Besides, the magnetic basement relief of the plain is
                estimated    by    doing    the    downward    continuation    through   the 
                pseudo-gravity anomalies.

                                          Reference

               Hsieh, S.H., 1970, Geology and gravity anomalies of the Pingtung plain, Taiwan,
               Proc. Geol. Soc. China, no. 13, 76-89

                                           (Abstract)(Full text)

              Chaing, S. C., 1971, Seismic study of the Chaochou Structure, Pingtung, Taiwan, 
              Petroleum Geol. Taiwan, no. 8, 281-294

                                           (Abstract)(Full text)