WEPA40 RJTD 051918 TSUNAMI BULLETIN ISSUED BY JMA AT 1918Z 5 DEC ORIGIN TIME 1844Z 5 DEC PRELIMINARY EPICENTER LAT 40.3 N. LON 124.7 W. WESTERN NORTH AMERICA FOCAL DEPTH /// KM MAG 7.3 NO SIGNIFICANT TSUNAMI IS EXPECTED IN COASTAL AREAS OF JAPAN NO FURTHER ACTION WILL BE TAKEN=