Hidden Threats Behind Megathrust<\/strong><\/p>\n\n\n\n So far, public attention has largely been focused on the potential for megathrust earthquakes in western Sumatra and southern Java. However, according to Mohammad Syamsu Rosid, other threats are actually located closer to densely populated areas, namely in the back-arc basin region that stretches from Sumatra, northern Java, to East Nusa Tenggara.<\/p>\n\n\n\n He cited the activity of onshore faults such as the Kendeng Fault and the Baribis Fault, which have shallow hypocenters. Although their energy is smaller compared to megathrust earthquakes, the resulting damage can be far greater, as seen in the 2022 Cianjur earthquake.<\/p>\n\n\n\n In Jakarta, the presence of the Baribis Fault is said to still hold many uncertainties. Several active fault segments are believed to be buried beneath sediments, making them classified as blind thrust fault . blind thrust fault<\/em> atau sesar tersembunyi.<\/p>\n\n\n\n To identify these threats, Mohammad Syamsu Rosid encouraged the use of microgravity gradiometry or Vertical Gravity Gradient technology, which is capable of mapping variations in subsurface densit<\/p>\n\n\n\n <\/p>\n\n\n\n Human Activities Exacerbate the Risk<\/strong><\/p>\n\n\n\n In addition to tectonic factors, he also highlighted the contribution of human activities in exacerbating disaster risks. In Jakarta, for example, excessive groundwater extraction has led to land subsidence (land subsidence<\/em>) of more than 10 centimeters per year in northern areas.<\/p>\n\n\n\n \u201cThe Earth does not negotiate. When its balance is disturbed, it will respond through disasters,\u201d he said.<\/p>\n\n\n\n He compared the situation to cities such as Tokyo and Osaka, which are considered successful in controlling the rate of land subsidence through appropriate policies.<\/p>\n\n\n\n A similar phenomenon is also occurring in the Lake Toba area, where water levels have declined by an average of 24 millimeters per year over the past six decades, influenced by climate change and human activities.<\/p>\n\n\n\n Science-Based Solutions<\/strong><\/p>\n\n\n\n As mitigation measures, Mohammad Syamsu Rosid proposed several approaches based on geophysical technology. These include the geoelectrical method to detect slip surfaces in landslide-prone areas, the application of geomechanics principles in geothermal energy management, as well as the use of the Vertical Gravity Gradient method for mapping fault structures in urban regions.<\/p>\n\n\n\n He emphasized that geological disasters are not merely natural phenomena, but also the result of interactions between humans and the environment.<\/p>\n\n\n\n \u201cWe cannot prevent earthquakes, but we can reduce the risks through science and development policies that are in harmony with natural balance,\u201d said Mohammad Syamsu Rosid.<\/p>\n\n\n\n The speech also underscored the importance of strengthening research on seismic disaster mitigation, particularly in the back-arc basin regions, as well as the use of advanced gravity-based technologies to detect active faults that have long remained hidden.<\/p>","protected":false},"excerpt":{"rendered":" Guru Besar Tetap Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia (UI) bidang geofisika, Prof. Drs. Mohammad Syamsu Rosid, M.T., Ph.D. menegaskan bahwa stabilitas geologi Indonesia saat ini berada pada titik kritis akibat kombinasi dinamika alam dan aktivitas manusia. Pernyataan tersebut disampaikan dalam pidato pengukuhannya sebagai Guru Besar Tetap FMIPA UI bidang Ilmu Geofisika pada […]<\/p>\n","protected":false},"author":12,"featured_media":14724,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-14723","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-berita"],"blocksy_meta":[],"yoast_head":"\n![\"\"](\"https:\/\/sci-ui.id\/wp-content\/uploads\/2026\/04\/sci-544.jpeg\")
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