{"id":112042,"date":"2026-09-08T11:31:05","date_gmt":"2026-09-08T04:31:05","guid":{"rendered":"https:\/\/www.its.ac.id\/news\/?p=112042"},"modified":"2026-09-28T08:33:05","modified_gmt":"2026-09-28T01:33:05","slug":"understanding-volcanic-activity-in-indonesia-with-its-geologists","status":"publish","type":"post","link":"https:\/\/www.its.ac.id\/news\/en\/understanding-volcanic-activity-in-indonesia-with-its-geologists\/","title":{"rendered":"Understanding Volcanic Activity in Indonesia with ITS Geologists"},"content":{"rendered":"<blockquote>\n<figure id=\"attachment_111408\" aria-describedby=\"caption-attachment-111408\" style=\"width: 1080px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-111408\" src=\"https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.15.34-PM.jpeg\" alt=\"Gambaran erupsi yang terjadi pada Gunung Anak Krakatau (Foto: Pixabay)\" width=\"1080\" height=\"1080\" srcset=\"https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.15.34-PM.jpeg 1080w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.15.34-PM-300x300.jpeg 300w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.15.34-PM-1024x1024.jpeg 1024w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.15.34-PM-150x150.jpeg 150w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.15.34-PM-768x768.jpeg 768w\" sizes=\"(max-width: 1080px) 100vw, 1080px\" \/><figcaption id=\"caption-attachment-111408\" class=\"wp-caption-text\"><span dir=\"auto\">Image of the eruption that occurred at Mount Anak Krakatau (Photo: Pixabay)<\/span><\/figcaption><\/figure>\n<blockquote><p><b><span dir=\"auto\">ITS Campus, ITS News \u2014<\/span><\/b><span dir=\"auto\"> Recently, it was reported that Mount Anak Krakatau (GAK) erupted on Friday (September 4th), relatively close to the eruptions of Mount Ibu, Lewotolok, and Semeru. The eruptions of these four volcanoes, occurring within a short period of time, are often considered a domino phenomenon caused by a single geological factor.<\/span><\/p><\/blockquote>\n<\/blockquote>\n<p><span dir=\"auto\">Geologist Dr. M. Haris Miftakhul Fajar, MEng, <\/span><a href=\"http:\/\/its.ac.id\/\"><span dir=\"auto\">from the Sepuluh Nopember Institute of Technology<\/span><\/a><span dir=\"auto\"> (ITS), explained that the volcanic and tectonic activity is a natural phenomenon triggered by high-energy earth processes. This includes earthquakes and volcanic eruptions spread across various regions of the Indonesian archipelago.<\/span><\/p>\n<p><span dir=\"auto\">Haris explained that each volcano inherently has unique characteristics and a distinct eruption cycle. Therefore, their activity cannot be generalized. &#8220;The phenomenon of multiple volcanoes erupting simultaneously is part of the natural dynamics resulting from regional tectonic activity,&#8221; Haris explained.<\/span><\/p>\n<figure id=\"attachment_111407\" aria-describedby=\"caption-attachment-111407\" style=\"width: 6000px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"size-full wp-image-111407\" src=\"https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia.jpg\" alt=\"Ahli Geologi ITS Ajak Masyarakat Memahami Aktivitas Gunung Api di Indonesia\" width=\"6000\" height=\"4000\" srcset=\"https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia.jpg 6000w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia-300x200.jpg 300w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia-1024x683.jpg 1024w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia-768x512.jpg 768w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia-1536x1024.jpg 1536w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/Ahli-Geologi-ITS-Ajak-Masyarakat-Memahami-Aktivitas-Gunung-Api-di-Indonesia-2048x1365.jpg 2048w\" sizes=\"(max-width: 6000px) 100vw, 6000px\" \/><figcaption id=\"caption-attachment-111407\" class=\"wp-caption-text\"><span dir=\"auto\">ITS Geologists Invite the Public to Understand Volcanic Activity in Indonesia<\/span><\/figcaption><\/figure>\n<p><span dir=\"auto\">Haris further stated that each volcano has its own magma chamber system, magmatic processes, and independent tectonic characteristics. For example, Mount Semeru and Krakatoa are influenced by the interaction of the Indo-Australian Plate subducting beneath the Eurasian (Sunda) Plate, while Mount Ibu has a different tectonic system due to double subduction.<\/span><\/p>\n<p><span dir=\"auto\">Meanwhile, Mount Lewotolok is unique because it lies near the boundary of a subduction process that has ended. &#8220;This condition leaves a geological structure in the form of a tear in the subducted slab, which provides a magma supply,&#8221; explained Haris.<\/span><\/p>\n<p><span dir=\"auto\">The Head of the ITS Geophysical Engineering Department also explained that the magma chamber within the Earth functions like a sponge-like cavity with channels formed by large cracks in the rock. This cavity holds the molten rock from within the Earth.<\/span><\/p>\n<p><span dir=\"auto\">Haris explained that the abundant fluid and water vapor within the magma have characteristics similar to soda in a closed bottle. &#8220;The higher the gas pressure, the more likely it is that an eruption will occur when the pathway is opened,&#8221; he said.<\/span><\/p>\n<p><span dir=\"auto\">On the other hand, the magma chamber will slowly cool if the magma supply from beneath the earth stops and there are no further triggers for tectonic activity. This very slow cooling causes the minerals in the magma to crystallize in an orderly manner. &#8220;So the mountain&#8217;s volcanic activity will gradually cease on its own without triggering an eruption,&#8221; Haris explained.<\/span><\/p>\n<p><span dir=\"auto\">Furthermore, volcanic eruptions are also triggered by external factors, such as tectonic earthquakes, which exert pressure on an already full magma chamber. The sudden increase in pressure causes the cap or gap in the chamber to break free, triggering an eruption. However, this is greatly influenced by the distance between the earthquake source and the magma chamber.<\/span><\/p>\n<p><span dir=\"auto\">Therefore, Haris explained that the activity level of each volcano varies greatly. Some continue to exhibit continuous seismic activity, while others can remain completely dormant for hundreds of years before reactivating. Due to this variation, monitoring is carried out continuously and classified into four levels: Normal, Alert, Standby, and Warning.<\/span><\/p>\n<figure id=\"attachment_111409\" aria-describedby=\"caption-attachment-111409\" style=\"width: 1200px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"size-full wp-image-111409\" src=\"https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.11.50-PM.jpeg\" alt=\"Laporan Seismogram Gunung Anak Krakatau secara langsung yang ditampilkan pada laman Magma Indonesia milik BVMBG (Foto: Magma Indonesia)\" width=\"1200\" height=\"720\" srcset=\"https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.11.50-PM.jpeg 1200w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.11.50-PM-300x180.jpeg 300w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.11.50-PM-1024x614.jpeg 1024w, https:\/\/www.its.ac.id\/news\/wp-content\/uploads\/sites\/2\/2026\/09\/WhatsApp-Image-2026-09-07-at-3.11.50-PM-768x461.jpeg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-111409\" class=\"wp-caption-text\"><span dir=\"auto\">A live seismogram report of Mount Anak Krakatau displayed on the PVMBG&#8217;s Magma Indonesia page (Photo: Magma Indonesia)<\/span><\/figcaption><\/figure>\n<p><span dir=\"auto\">This status is measured based on seismic monitoring, volcanic deformation, visual observations of the smoke column, and geochemical data. For example, the GAK eruption was dominated by a relatively small Strombolian eruption. However, it did have a fairly long duration, lasting almost 25 hours continuously.<\/span><\/p>\n<p><span dir=\"auto\">This long duration resulted in a continuous supply of volcanic ash being ejected into the air, reaching significant heights. &#8220;The ash spread in two directions\u2014southeast to the Banten region and west-southwest to Lampung and the Indian Ocean\u2014depending on the prevailing wind levels at the time, as confirmed by analysis of BMKG&#8217;s Himawari-9 imagery,&#8221; said the lecturer in the ITS Department of Geophysical Engineering.<\/span><\/p>\n<p><span dir=\"auto\">Haris emphasized that volcanic dynamics are a natural process that needs to be understood based on monitoring data. Understanding the characteristics of volcanoes is crucial for building preparedness for these geophysical dynamics.<\/span><\/p>\n<p><span dir=\"auto\">This understanding aligns with the Sustainable Development Goals (SDGs), particularly SDG point 11, which aims to ensure safe spatial planning from hazard zones and strengthen infrastructure resilience. Understanding the dynamics of volcanic activity, the magma cycle, and their impact on the environment surrounding volcanoes supports the preservation of terrestrial ecosystems, as outlined in SDG 15. <\/span><strong><span dir=\"auto\">(ITS Public Relations)<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>ITS Campus, ITS News \u2014 Recently, it was reported that Mount Anak Krakatau (GAK) erupted on Friday (September 4th), relatively close to the eruptions of Mount Ibu, Lewotolok, and Semeru. The eruptions of these four volcanoes, occurring within a short period of time, are often considered a domino phenomenon caused by a single geological factor. [&hellip;]<\/p>\n","protected":false},"author":775,"featured_media":111408,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"categories":[3707,3759],"tags":[],"class_list":["post-112042","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate-action-en","category-sustainable-cities-communities-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Memahami Aktivitas Gunung Api di Indonesia Bersama Ahli Vulka<\/title>\n<meta name=\"description\" content=\"ITS Geologist Dr M Haris Miftakhul Fajar MEng explained that the volcanic and tectonic activities that occurred were normal phenomena.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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