Situational Report for Taal Volcano Phreatomagmatic Eruption (2021) SitRep No. 9 for Taal Volcano Phreatomagmatic Eruption (2021) July 23, 2021 08:00 am 01 July 2021 At 3:16 PM, a short-lived phreatomagmatic eruption occurred at Main Crater and generated a dark grayish plume that rose 1000 meters. This was followed by four (4) short phreatomagmatic bursts that occurred at 6:26 PM, 7:21PM, 7:41PM and 8:20 PM that lasted not longer than two (2) minutes each and produced short jetted plumes that rose 200 meters above the Main Crater Lake. 02 July 2021 In the past 24-hour period, the Taal Volcano Network recorded twenty-nine (29) volcanic earthquakes, including one (1) explosion-type earthquake, twenty-two (22) low frequency volcanic earthquakes and two (2) volcanic tremor events having durations of three (3) minutes, and low-level background tremor that has persisted since 08 April 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose as much as three thousand (3000) meters high and drifted southwest and southeast have been observed from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 13,287 tonnes/day on 01 July 2021. In addition, vog was observed over Taal Volcano and vicinity. A series of three (3) short phreatomagmatic bursts occurred at 10:25 AM, 10:47 AM, 11:01 AM and produced short jetted plumes that rose 100 meters above the Main Crater Lake. Active upwelling of hot volcanic fluids of the Taal Main Crater Lake followed in the afternoon. 03 July 2021 In the past 24-hour period, the Taal Volcano Network recorded forty-eight (48) volcanic earthquakes, including two (2) volcano-tectonic earthquakes, forty (40) low frequency volcanic earthquakes, six (6) volcanic tremor events having durations up to four (4) minutes, and low-level background tremor that has persisted since 08 April 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose as much as three thousand (3,000) meters high that drifted southwest and north-northwest were generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 10,254 tonnes/day on 02 July 2021. In addition, vog was observed over Taal Volcano and vicinity. 04 July 2021 In the past 24-hour period, the Taal Volcano Network recorded thirty-one (31) low frequency volcanic earthquakes and low-level background tremor that has persisted since 08 April 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose as much as two thousand five hundred (2,500) meters high that drifted south- southwest was generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 14,699 tonnes/day on 03 July 2021. In addition, vog was observed over Taal Volcano and vicinity. 05 July 2021 In the past 24-hour period, the Taal Volcano Network recorded seventeen (17) volcanic earthquakes, including one (1) volcanic tremor event having a duration of forty-five (45) minutes, sixteen (16) low frequency volcanic earthquakes, and low-level background tremor that has persisted since 08 April 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose as much as two thousand five hundred (2,500) meters high that drifted southwest, southeast, and north-northwest was generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 22,628 tonnes/day on 04 July 2021. 06 July 2021 In the past 24-hour period, the Taal Volcano Network recorded thirty-nine (39) volcanic earthquakes, including two (2) volcanic tremor events having durations of three (3) to five (5) minutes, thirty-five (35) low frequency volcanic earthquakes, two (2) hybrid earthquakes and low-level background tremor that has persisted since 08 April 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose as much as three thousand (3,000) meters high before drifting south and east were generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 5,299 tonnes/day on 05 July 2021. Telefax: NDRRMC Operations Center: (+632) 8911-1406; 8912-2665; 8912-5668; Office of the Administrator (+632) 8912-2424 Email: [email protected] Websites: www.ocd.gov.ph; ndrrmc.gov.ph 07 July 2021 At 5:18 AM today, a short-lived phreatomagmatic eruption occurred at Main Crater and generated a grayish plume that rose 300 meters before drifting southeast. In the past 24-hour period, the Taal Volcano Network recorded fifty-five (55) volcanic earthquakes, including one (1) explosion-type earthquake, forty-four (44) low frequency volcanic earthquakes, five (5) volcanic tremor events having durations of two (2) to five (5) minutes, five (5) hybrid earthquakes and low-level background tremor that has persisted since 08 April 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose one thousand five hundred (1,500) meters before drifting southwest was generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 7,560 tonnes/day on 06 July 2021. 8 July 2021 A series of five (5) short phreatomagmatic bursts occurred at 08:47 AM, 09:15 AM, 09:26 AM, 11:56 AM, and 09:41 PM yesterday and produced short jetted plumes that rose up to 700 meters above the Main Crater Lake. In the past 24-hour period, the Taal Volcano Network recorded sixty-one (60) volcanic earthquakes, including five (5) explosion-type earthquakes, twenty-four (24) low frequency volcanic earthquakes, twenty-one (21) volcanic tremor events having durations of two (2) to four (4) minutes, ten (10) hybrid earthquakes, and low-level background tremor that ended yesterday at 06:21 PM but resumed at 09:52 PM. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam- rich plumes that rose one thousand five hundred (1,500) meters before drifting southwest was generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 11,397 tonnes/day on 07 July 2021. 9 July 2021 A series of five (5) short phreatomagmatic bursts occurred at 06:47 AM, 06:06 PM, 09:21 PM, 09:50 PM yesterday, and 02:59 AM today and produced short, jetted plumes that rose to 200 meters above the Main Crater Lake. In the past 24-hour period, the Taal Volcano Network recorded fifty-eight (58) volcanic earthquakes, including five (5) explosion-type earthquakes, twenty-four (24) low frequency volcanic earthquakes, twenty-seven (27) volcanic tremor events having durations of one (1) to six (6) minutes, two (2) hybrid earthquakes, and low-level background tremor that has persisted since 07 July 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose one thousand two hundred (1,200) meters before drifting northwest was generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 6,095 tonnes/day on 08 July 2021. 10 July 2021 In the past 24-hour period, the Taal Volcano Network recorded eight (8) volcanic earthquakes, including two (2) low frequency volcanic earthquakes, five (5) volcanic tremor events having durations of one (1) to two (2) minutes, and low- level background tremor that has persisted since 07 July 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose one thousand two hundred (1,200) meters before drifting generally west was generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 4,149 tonnes/day on 09 July 2021. 11 July 2021 In the past 24-hour period, the Taal Volcano Network recorded seventy-four (74) volcanic earthquakes, including thirteen (13) low frequency volcanic earthquakes, sixty-one (61) volcanic tremor events having durations of one (1) to twenty-five (25) minutes, and low-level background tremor that has persisted since 07 July 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose one thousand (1,000) meters before drifting west- northwest and southwest were generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 6,488 tonnes/day on 10 July 2021. 12 July 2021 In the past 24-hour period, the Taal Volcano Network recorded one hundred eighty-five (185) volcanic earthquakes, including seven (7) low frequency volcanic earthquakes, one hundred seventy-six (176) volcanic tremor events having durations of one (1) to sixteen (16) minutes, and low-level background tremor that has persisted since 07 July 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose one thousand five hundred (1,500) meters before drifting southwest and west-northwest were generated from the Taal Main Crater. Sulfur dioxide (SO2) emission averaged 6,421 tonnes/day on 11 July 2021. 13 July 2021 In the past 24-hour period, the Taal Volcano Network recorded one hundred seventy-one (171) volcanic earthquakes, including thirteen (13) low frequency volcanic earthquakes, one hundred fifty-seven (157) volcanic tremor events having durations of one (1) to ninety-seven (97) minutes, and low-level background tremor that has persisted since 07 July 2021. High levels of volcanic sulfur dioxide or SO2 gas emissions and steam-rich plumes that rose one thousand five hundred (1,500) meters before drifting southwest were generated from the Taal Main Crater. Sulfur dioxide (SO2) emission Page 2/12 averaged 6,134 tonnes/day on 12 July 2021. 14 July 2021 In the past 24-hour period, the Taal Volcano Network recorded six (6) volcanic earthquakes, including six (6) volcanic tremor events having durations of twelve (12) minutes, and low-level background tremor that has persisted since 07 July 2021.