By Mike Crismundo
BUTUAN CITY – Three mild tectonic earthquakes jolted Surigao provinces Monday morning, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.
The Surigao del Norte and Surigao del Sur provincial disaster risk reduction and management councils reported no damage or injury.
In its bulletin, Phivolcs said a 3.3 magnitude tremor was recorded at 6:32 a.m. on Monday.
The epicenter was plotted 64 kilometers (km) northeast of Pacific Ocean facing town of Burgos, Siargao Island, Surigao del Norte.
The tremor had a shallow depth of only 1 km, it said.
At 4:21 a.m. of the same day (Oct. 1), a magnitude 3.9 earthquake was also recorded.
The epicenter was traced 14 km southwest of Malimono town, also of that same province, with a depth of 22 km, Phivolcs said.
Phivolcs said Intensity III was also registered in Surigao City.
At 1:13 a.m., a 2.2 magnitude tremor was also registered and its epicenter was located only 6 km northeast of Tandag City, Surigao del Sur province, with a depth of 30 km, Phivolcs also reported in its bulletin.
The three tremors were all tectonic in origin and the state agency did not raise a tsunami alert.
Meanwhile, at 4:12 a.m. of the same day (Oct. 1), a 3.5 magnitude earthquake was also recorded and its epicenter was pinpointed 14 km northeast of Sibagat town, Agusan del Sur province, with a depth of 9 km, the state agency said.
The earthquake was tectonic in origin and the state agency did not expect aftershocks.