Magnetic Anomaly Map of East Asia (MAMEA)

Home   >  Our Work   >  Projects   >  Magnetic Anomaly Map of East Asia (MAMEA)
CCOP-GSJ MAMEA Project
“Compilation and Publication of a Revised Magnetic Anomaly Map of East Asia at 1:4,000,000,” Duration: 2016 - 2021
Funding Source: Geological Survey of Japan (GSJ), AIST
The CCOP-GSJ MAMEA project “Compilation and Publication of a Revised Magnetic Anomaly Map of East Asia at 1:4,000,000,” was endorsed at the 67th CCOP (Coordinating Committee for Geoscience Programmes in East and Southeast Asia) Steering Committee Meeting in Bangkok, Thailand, in November 2016. The CCOP Aeromagnetic Map Compilation Programme (1987-1990) produced two sheets of “Magnetic Anomaly Map of East Asia at 1:4,000,000” in 1994, then its CD-ROM versions in 1996 (1st edition) and in 2002 (2nd edition). However, these CD-ROM products are no longer available from GSJ/CCOP because of software incompatibility. The objective of the new project is to create a more complete digital data product for the magnetic anomaly map of the CCOP region with possible data contribution from the CCOP Member Countries and additional marine and land data available now. The compilation, particularly, preparation of new data, were carried out in close cooperation of the Contact Persons from the CCOP Member Countries (Table 1). In this compilation, we expanded the compilation area to cover all of the CCOP Member Countries. The geographical target of the compilation is a vast area in East and Southeast Asia, extending from longitude 93?E to 160?E and from latitude 12?S to 46?N.
Outcome
The final product includes a JPEG image file of the magnetic anomaly map of the whole area and three additional image files of more detailed anomaly maps of Thailand-Malaysia, Philippines, and Papua New Guinea (PNG) areas. The product also includes grid data files which were used in making the image files: one file for the whole area with 2-minute grid size, and three files for the detailed areas with 1-minute grid size. The magnetic anomaly data of land areas are converted by mathematical continuation to those with an altitude of 1,500 m above ground for the whole area map, while to 300 m (or 1,000 m) above ground for the detailed maps.
This product is available for download only in zip file, mamea_files2021.zip. This contains the following files:
1. Explanatory Note
2. The folder “maps” includes the following four JPEG files:
  • - mamea20.jpg for “Magnetic Anomaly Map of East and Southeast Asia”
  • - thmal.jpg for “Magnetic Anomaly Map of the Thailand–Malaysia Area”
  • - phil.jpg for “Magnetic Anomaly Map of the Philippines Area”
  • - png.jpg for Magnetic Anomaly Map of the Papua New Guinea Area”
3. The folder “grids” includes the following four ASCII data files:
  • - Data file mamea20.xym includes a 2-minute grid data set of magnetic anomalies used to make “Magnetic Anomaly Map of East and Southeast Asia,” excluding the area where the WDMAM data were used.
  • - Data file thmal.xyhm includes a 1-minute grid data set of magnetic anomalies used to make “Magnetic Anomaly Map of the Thailand–Malaysia Area”
  • - Data file phil.xyhm includes a 1-minute grid data set of magnetic anomalies used to make “Magnetic Anomaly Map of the Philippines Area”
  • - Data file png.xyhm includes a 1-minute grid data set of magnetic anomalies used to make “Magnetic Anomaly Map of the Papua New Guinea Area”


Alternate download sites are as follows,
https://www.gsj.jp/Map/EN/cd_dvd_list.html
https://www.gsj.jp/Map/EN/asia-area-geoscience.html