Rappler's latest stories on seismology
Bulusan Volcano in Sorsogon is now 'in an abnormal condition' and sudden phreatic or steam-driven eruptions are possible, warns Phivolcs on Monday, July 6
State volcanologists remind the public that Kanlaon Volcano has been under Alert Level 1 since March 11, which means it is in a period of unrest
The Philippine Institute of Volcanology and Seismology records at least 81 earthquakes at Kanlaon Volcano in a 10-hour period
Phivolcs calls for vigilance, warning that volcanic deposits from Mayon's 2018 eruption could mix with rainfall from Severe Tropical Storm Ambo (Vongfong), possibly resulting in lahar
The earthquake is felt in parts of NCR, Oriental and Occidental Mindoro, Cavite, Batangas, Bulacan, Pampanga, Nueva Ecija, Quezon, and Aurora
(UPDATED) 'Alert Level 1 means that the volcano is still in abnormal condition and should not be interpreted that unrest has ceased,' says Phivolcs on Thursday, March 19
Kanlaon Volcano is now 'at an abnormal condition and has entered a period of unrest,' says Phivolcs on Wednesday, March 11
The jolt was felt all the way in Cebu City and towns across the northern end of the island
(UPDATED) 'Alert Level 2 means that there is decreased unrest, but should not be interpreted that unrest has ceased,' says Phivolcs on Friday, February 14
Phivolcs maintains Alert Level 3 for Taal Volcano on Thursday, February 13. It has been at that status for more than two weeks.
Phivolcs says on Wednesday, February 12, that there were 101 volcanic earthquakes in the past 24 hours, higher than the previous figure of 87
The Philippine Institute of Volcanology and Seismology maintains Taal Volcano at Alert Level 3 on Tuesday, February 11, stressing that risks remain
Phivolcs says on Monday, February 10, that it recorded 11 harmonic tremors at Taal Volcano in the past 24 hours
Phivolcs maintains Alert Level 3 for Taal Volcano on Sunday, February 9. There are 5 harmonic tremors in the past 24 hours.
Phivolcs again notes 'weak steaming from fissure vents' along Daang Kastila Trail on Saturday, February 8
Phivolcs says on Friday, February 7, that 'weak steaming from fissure vents' along Taal Volcano's Daang Kastila Trail is ongoing
The 11 harmonic tremors in the past 24 hours lasted 2 to 3 minutes each, says Phivolcs on Thursday, February 6
'With loss of power supply, no data will be transmitted from this station and consequently will affect the monitoring of Mayon Volcano,' says Phivolcs
Phivolcs reminds the public that Mayon Volcano has been under Alert Level 2 since March 29, 2018, which means a 'moderate level of unrest'
The 18 harmonic tremors are among 156 volcanic earthquakes in the past 24 hours, says Phivolcs on Wednesday, February 5
A harmonic tremor, a type of volcanic earthquake where the shaking is prolonged, indicates the movement of magma. Taal Volcano stays under Alert Level 3 on Tuesday, February 4.
Phivolcs says the volcanic earthquake was magnitude 3.2 and struck at 4:20 am on Monday, February 3. It is among the latest quakes which show magma is still moving beneath Taal Volcano's crater.
Volcanic earthquakes still persist, indicating the movement of magma beneath Taal Volcano's crater, says Phivolcs on Sunday, February 2
Phivolcs says on Saturday, February 1, that Taal Volcano's latest harmonic tremor lasted 3 minutes. It indicates continuing movement of magma.
It's been a long first month of 2020 for those affected by the Taal Volcano eruption, and Phivolcs reiterates that the unrest is not over yet
Phivolcs records a harmonic tremor, or rhythmic shaking associated with magma movement, on Thursday, January 30
Taal Volcano stays at Alert Level 3 on Wednesday, January 29
Despite the easing situation, Phivolcs reiterates on Tuesday, January 28, that Alert Level 3 remains raised for Taal Volcano, since the unrest has not completely stopped
Phivolcs says the downgrading of Taal Volcano to Alert Level 3 means a 'decreased tendency towards hazardous eruption,' but it does not mean 'that the threat of a hazardous eruption has disappeared'
Phivolcs says on Saturday, January 25, that Taal Volcano continues to emit 'white steam-laden plumes' and sulfur dioxide, a major gas component of magma
Phivolcs says a person would not be able to run from a hazardous Taal Volcano eruption if it occurs while he or she is on the island
Phivolcs officials explain reported probabilities of a hazardous Taal Volcano eruption happening, and provide details of the 'complex' situation as of Thursday, January 23
(UPDATED) 'Hindi porque bumaba ang SO2 (sulfur dioxide) ay safe na tayo, dahil puwedeng nababarahan lamang ang mga labasan ng SO2,' says Phivolcs official Maria Antonia Bornas on Wednesday, January 22
'We understand their plight, so we are working doubly hard so we can give them the best information,' says Phivolcs official Maria Antonia Bornas on Tuesday, January 21
Phivolcs reiterates on Monday, January 20, that people are strongly advised to stay out of high-risk areas surrounding Taal Volcano
(UPDATED) Phivolcs official Maria Antonia Bornas says on Sunday, January 19, that they are looking at all scenarios for Taal Volcano
(UPDATED) 'Habang may paggalaw ng magma, ibig sabihin hindi pa talaga siya humuhupa,' says Phivolcs Director Renato Solidum Jr on Saturday, January 18
'Stupidity is blaming a scientific institution for failure in doing the impossible: predicting volcanic eruptions,' one netizen says
Phivolcs says on Friday, January 17, that 'steady steam emission' has been observed from Taal Volcano, while existing fissures or cracks in parts of Batangas have widened by a few centimeters
The Philippine Institute of Volcanology and Seismology says it is 'almost unlikely' for the low tide in Oriental Mindoro to cause a volcanic tsunami
(UPDATED) Phivolcs says a hazardous eruption is still 'imminent,' but it is now looking at the possibility that there may be a lull for a considerable period of time
Phivolcs says it is 'almost unlikely' for Taal Volcano to draw in water from the seas surrounding Oriental Mindoro because they are not connected
Phivolcs says on Wednesday, January 15, that 'intense seismic activity' indicates magma is still rising and the possibility of a 'hazardous' eruption remains
President Rodrigo Duterte does not give a categorical answer to the suggestion and ruminates instead on the warm bodies needed to prevent people from returning to the island volcano
The Philippine Institute of Volcanology and Seismology says volcanic earthquakes are induced by 'rising lava or magma beneath active volcanoes'
(UPDATED) Volcanic earthquakes continue and fissures or cracks are seen in parts of Batangas, indicating that Taal Volcano magma continues to rise
Mayon Volcano has been under Alert Level 2 since March 2018
Phivolcs maintains that there is 'no reliable technology in the world that can confidently predict the date, time, and location of large earthquakes'
The Philippine Institute of Volcanology and Seismology (Phivolcs) classifies Taal Volcano, with its 47 craters and 4 maars, as a complex volcano system