TAAL VOLCANO BULLETIN 07 August 2021 8:00 AM In the past 24-hour period, the Taal Volcano Network recorded one hundred three (103) 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. Activity at the Main Crater consisted of weak emission of steam-laden plumes from fumarolic vents that rose fifteen (15) meters. Sulfur dioxide (SO2) emission averaged 3,938 tonnes/day on 06 August 2021. Based on ground deformation parameters from electronic tilt, continuous GPS and InSAR monitoring, Taal Volcano Island has begun deflating in April 2021 while the Taal region continues to undergo very slow extension since 2020. Alert Level 2 (Decreased Unrest) now prevails over Taal Volcano. DOST-PHIVOLCS reminds the public that at Alert Level 2, sudden steam- or gas-driven explosions, volcanic earthquakes, minor ashfall, and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within and around TVI. DOST-PHIVOLCS strongly recommends that entry must be strictly prohibited into Taal Volcano Island, Taal’s Permanent Danger Zone or PDZ, especially the vicinities of the Main Crater and the Daang Kastila fissure, and occupancy and boating on Taal Lake. Local government officials are advised to continuously assess and strengthen the preparedness of previously evacuated barangays around Taal Lake in case of renewed unrest. Civil aviation authorities must advise pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircraft. DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately communicated to all stakeholders DOST-PHIVOLCS 原文：https://www.phivolcs.dost.gov.ph/index.php/volcano-hazard/volcano-bulletin2/taal-volcano/12630-taal-volcano-bulletin-07-august-2021-8-00-am DOST-PHIVOLCS是菲律賓火山暨地震研究所的自然科技部門 菲律賓的塔爾火山（Taal Volcano）在2020年1月12日曾經爆發過一次，最近又開始蠢蠢欲動了。在這個公告中，可以發現塔爾火山開始出現 （1）密集的、由火山引起的地震，並且有持續的低頻震動 （2）周遭的二氧化硫濃度變高 （3）曾經噴發蒸氣羽流 （4）該地地表有長期的擴張現象 菲律賓火山暨地震研究所曾在今年七月初將警戒升至三級，並且疏散附近的民眾。現已將塔爾火山警戒降至二級。菲律賓的火山警報分為以下級數（可參考當局官網） 第一級：出現低程度火山擾動 第二級：地震、氣體排放等火山預警的監測項目變得異常 第三級：有岩漿侵入岩層，可能火山爆發 第四級：火山瀕臨爆發 第五級：火山已爆發 之後會持續留意塔爾火山的消息，再做更新。 其實我對於塔爾火山的最深刻的印象是它的地形，打開電子地圖，圖層調成衛星影像，可以發現它有個島中湖中島中湖中島！
