At least 14 earthquakes rocked the province of Marinduque from Saturday afternoon to Sunday morning, according to the Philippine Institute of Volcanology and Seismology (Phivolcs).
In a phone interview, Ishmael Narag, officer in charge of seismologist of earthquake monitoring division of the agency, said the quakes happened in Marinduque were called “earthquake swarms” which “are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time.”
“Swarm of events happened in Marinduque, we don’t expect aftershocks but the events followed one (temblor) after the other in time and in same location,” Narag said.
Phivolcs said the first tremor struck Boac at 6:33 p.m. Saturday with a magnitude of 4.5. The epicenter was traced 29 kilometers northwest of Boac town. The quake had a depth of 32 kilometers.
The agency said Intensity 3 quake occurred in Batangas City; Boac, Marinduque while, Intensity 1 at Tagaytay City.
At around 9:06 p.m., the second tremor struck with a magnitude of 3.0. Its epicenter was located 26 kilometers southwest of Boac with a depth of one kilometer.
The third tremor, at around 10:54 p.m., had a magnitude of 2.5, took place. Its epicenter was located 34 kilometers northwest of Boac with a depth of seven kilometers.
At around 12:55 a.m. Sunday, the fourth tremor struck with magnitude of 3.6. Its epicenter was located 36 kilometers northwest of Boac with a depth of 15 kilometers.
At around 1:08 a.m., the fifth tremor took place with magnitude 2.6, took place. The epicenter was located 30 kilometers northwest of Boac with a depth of 15 kilometers.
At around 1:44 a.m., the sixth tremor had a magnitude 1.4.
The epicenters of the eight succeeding quakes were all located in northwest of Boac and ranged from 1.8 to 4.2 magnitude.
The 14th and last tremor was recorded around 7:20 a.m. on Sunday, with magnitude 2.8. Its epicenter was located 24 kilometers northwest of Boac with a depth of 21 kilometers.
Narag said there were no damage or casualty reported from the 14 temblors, which were all tectonic in origin.