But despite the strong intensity of the earthquakes, it did not trigger a tsunami warning. Authorities did not report damage in any of the islands.
A 5.5 magnitude quake with a depth of 121-km. jolted Guam around 1:08 p.m. yesterday.
Its epicenter was located 146-km. or 91 miles west-southwest of the territory and about 352-km. or 218 miles southwest of Saipan.
The same quake also traveled to Jayapura, Irian Jaya, Indonesia, which is 1,078 miles away.
On Sunday, two 5.6 magnitude quakes struck Saipan and Guam, one hour apart that began at 9:33 a.m.
The U.S. Geological Survey said the first was recorded at a depth of 49-km., the second at 16-km.
The Japan Meteorological Agency also recorded an earthquake in the Marianas on Sunday with a 6.4 magnitude.
The agency said the quake with a depth of 10-km struck the islands around 6:35 a.m.
The USGS warned last Friday about Pagan volcano’s unrest with observers witnessing a low-level ash burst that produced a diffuse, dark colored, ash and steam plume rising to about 1.5-km. above sea level.
Though the incident was not hazardous to high-flying aircraft, the USGS warned that additional ash bursts might occur without warning.
Located about 173 miles north of Saipan, Pagan has two stratovolcanoes whose last major eruption occurred in 1981, triggering the evacuation of its residents, most of whom now reside here.
The USGS said Pagan is not monitored with ground-based geophysical instrumentation and the only source of information is satellite observation and occasional reports from observers who visit the island.
The USGS announced last year it planned to use its American Recovery and Reinvestment Act funds to upgrade volcano monitoring and the analysis and distribution of eruption information at the five volcano observatories that covered Wyoming, Alaska, Hawaii, the Northwest, California, as well as the Northern Marianas.
It described the island-chain as having some of the most active explosive volcanoes in the U.S. that threaten not only international air and shipping routes, but also Saipan and Guam where military installations are located.
