Heavy rainfall triggers muddy streamflow near Bulusan slopes | Inquirer News

Heavy rainfall triggers muddy streamflow near Bulusan slopes

/ 05:15 AM July 02, 2022
Heavy rainfall on Friday triggered a muddy streamflow near the slopes of Mt. Bulusan in Juban town in Sorsogon province.

MURKY WATER Grayish to brown water flows along Rangas River in Barangay Rangas in Juban, Sorsogon, on Friday morning. Disaster response officials say the muddy streamflow, caused by Mt. Bulusan’s ash deposit dislodged by heavy rainfall, poses no threat to nearby residents. —PHOTO COURTESY OF ARVEE LODRONIO

LEGAZPI CITY—Heavy rainfall on Friday triggered a muddy streamflow near the slopes of Mt. Bulusan in Juban town in Sorsogon province.

Arvee Lodronio, head of the municipal disaster risk reduction and management office of Juban, said the muddy flow was observed along the Rangas River in Barangay Rangas but that it was not threatening to the residents near the area.

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“It flows only along the waterways of the Rangas River. The residents are safe because we have flood control there,” he said.

He said volcanic deposits from the gully on the northwest slopes of Bulusan were carried down by the rainfall that started around 4 a.m. on Friday.Lodronio said the residents thought the volcano was erupting again when they smelled sulfur in the area.

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Volcanic sediment

He said traces of volcanic deposits were left in the river after the water level receded.Science Undersecretary Renato Solidum Jr., who heads the Philippine Institute of Volcanology and Seismology (Phivolcs), said a muddy streamflow has minor volcanic sediment content compared with a lahar flow.On June 26, a rain-triggered lahar flow was observed in the villages of Rangas, Añog and Calatagan in Juban town and along Calang Creek in Barangay Cogon in Irosin town.

Phivolcs warned that heavy rainfall may generate lahar on river channels.

25 volcanic quakes

In its Thursday bulletin, Phivolcs said it detected 25 volcanic earthquakes in the last 24 hours of monitoring.

The sulfur dioxide emission was measured at 724 tons on June 30.

The volcano is still inflated and remains under alert level 1, which means another phreatic eruption is possible, similar to its two previous stream-driven eruption on June 5 and June 12 that blanketed several villages in Juban with ash. —Ma. April Mier-Manjares, INQ

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TAGS: Eruption, Mt. Bulusan, Sorsogon, Volcano, Weather
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