Magnetic total field anomaly profiles along ship tracks. Anomalies, higher than the average value of -107 nT in this area, are shaded. The box indicates the magnetic anomaly which is the subject of analysis in this study shown in Fig. 9.
|
2.Magnetic Data Collection
|
|
2.2 Magnetic anomaly
|
|
Fig.4:
|
| The magnetic anomalies as measured on the ground and continued upward 460 m (1,500 ft) are shown in Fig. 4. The height of 460 m is chosen in order to even out the data density while preserving the characteristic high resolution. This height is also convenient for comparing with aeromagnetic maps measured over the offshore areas (GSJ, 1980; JICA, 1983). The magnetic anomalies on the peninsula reveal that a number of conspicuous isolated highs and lows are superimposed on a long wavelength anomaly pattern which has an east-west strike direction; the highest anomaly group is aligned along the ophiolitic rock outcrops, high anomalies are dominant to the south of 35°00'N, and low magnetic anomalies are distributed between these high anomalies. |
| The sea-borne magnetic anomalies feature a low anomaly belt extending in the ESE-WNW direction with high anomalies surrounding it (Fig. 5). The general trend is correlated well with the published magnetic anomaly map (GSJ and CCOP, 1996). High anomalies with short wavelength and large amplitude, which do not appear on the published map, were observed at 14'deg;07'E, 35°01'N in the south of the Mineoka Belt. |
|
Fig.5:
Magnetic total field anomaly profiles along ship tracks. Anomalies, higher than the average value of -107 nT in this area, are shaded. The box indicates the magnetic anomaly which is the subject of analysis in this study shown in Fig. 9. |
|
