{
    "success": true,
    "data": {
        "id": 1870031,
        "msgid": "java-shaken-by-five-earthquakes-today-expert-issues-reminder-1784544776",
        "date": "2026-07-20 17:28:00",
        "title": "Java Shaken by Five Earthquakes Today, Expert Issues Reminder",
        "author": "",
        "source": "CNBC",
        "tags": "",
        "topic": "Geophysics",
        "summary": "The island of Java experienced five minor earthquakes on Monday, with tremors recorded in East Java, Banten, West Java, and Bali. Seismologist Daryono explained that these micro-earthquakes are not trivial events but provide vital structural information about the Earth's crust. He warned that while small quakes can release energy gradually, they may also act as foreshocks or indicate stress accumulation that could trigger a larger event.",
        "content": "<p>The Meteorology, Climatology and Geophysics Agency (BMKG) reported\nthat at least five earthquakes shook the island of Java on Monday\n(20\/7\/2026).<\/p>\n<p>The first, a magnitude 2.8 tremor, struck 66 kilometres southeast of\nPacitan, East Java, at 09:26:32 WIB, with a depth of 20 kilometres. This\nwas followed by a magnitude 3.7 earthquake at 10:18:56 WIB, located 72\nkilometres southwest of Bayah, Banten, at a depth of 16 kilometres.<\/p>\n<p>A third tremor, measuring magnitude 2.9, occurred at 12:40:01 WIB, 39\nkilometres southwest of Sumur, Banten, at a depth of 27 kilometres. A\nmagnitude 2.8 earthquake then struck 116 kilometres southwest of\nJembrana, Bali, at 13:03:34 WIB at a depth of 24 kilometres. The fifth\nand final earthquake recorded by BMKG was a magnitude 2.9 tremor centred\n74 kilometres southeast of Pangandaran Regency, West Java, at a depth of\n58 kilometres, occurring at 14:34:39 WIB.<\/p>\n<p>Daryono, an earthquake expert and member of the Indonesian\nAssociation of Disaster Experts (IABI), explained that minor and\nmicro-earthquakes are not merely fleeting vibrations to be\ndismissed.<\/p>\n<p>\u2018From a seismological perspective, low-amplitude tremors store vital\nstructural information regarding the dynamics of the Earth\u2019s crust\nbeneath our feet,\u2019 he told CNBC Indonesia. \u2018Each release of micro-energy\nprovides a precise picture of the existence and activity level of fault\nzones.\u2019<\/p>\n<p>Daryono explained that faults or subduction zones that frequently\nrelease small earthquakes indicate the zone is experiencing shear\nweakening and is in an active deformation phase. The mapping pattern of\nepicentres and hypocentres from these small earthquake clusters helps\nseismologists accurately map fault geometry, determine the direction of\nshift, and detect ongoing tectonic stress accumulation along fault\nlines.<\/p>\n<p>Furthermore, he added, a series of small earthquakes can act as\nforeshocks before a mainshock. The gradual release of seismic waves on a\nsmall scale indicates microfracturing in rocks at depth, which are\nbecoming increasingly brittle under tectonic pressure.<\/p>\n<p>\u2018Although small earthquakes are often considered a form of gradual\nenergy release, the accumulation of large-scale tectonic energy in\nlocked zones still has the potential to trigger severe shaking in the\nfuture,\u2019 Daryono stated. He stressed that understanding and monitoring\nsmall earthquakes is a fundamental key in seismic engineering and\nseismic hazard mapping. \u2018Information on the wave spectrum and frequency\nlevels from small vibrations helps engineers measure local site effects\nand wave amplification, which is crucial for design.\u2019<\/p>",
        "url": "https:\/\/jawawa.id\/newsitem\/java-shaken-by-five-earthquakes-today-expert-issues-reminder-1784544776",
        "image": ""
    },
    "sponsor": "Okusi Associates",
    "sponsor_url": "https:\/\/okusiassociates.com"
}