Japan Meteorological Agency. JMA established a tsunami warning service in 1952. JMA now serves as a National Tsunami Warning System that continuously monitors 24 hours-a-day all seismic activity in Japan, and issues timely information concerning earthquakes and tsunamis. In 2005, the JMA began operations of the Northwest Pacific Tsunami Advisory Center (NWPTAC ). The NWPTAC provides supplementary tsunami information for events in and around Japan and the northwest Pacific, and interim services for the South China Sea region, in close coordination with the PTWC. From 2005-2012, JMA and PTWC provided interim services for the Indian Ocean. (