Real-time coverage of earthquake event — 130 km W of Ternate, Indonesia — Pandita Data.
🌍 OPEN LIVE 3D EARTHQUAKE MAPA 5.8-magnitude earthquake struck 130 km west of Ternate, Indonesia at 22:58 UTC on July 23, 2026, at a depth of 49.2 km. The event occurred in a region of intense tectonic activity where the Pacific Plate subducts beneath the Philippine Sea Plate. No tsunami warning was issued, and the USGS PAGER alert remains green, indicating minimal expected casualties and infrastructure damage. The rupture, occurring at moderate depth in a subduction zone context, generated seismic waves across the Molucca Sea region but remained below the threshold for widespread population exposure.
Ternate, a city of approximately 190,000 people on nearby Ternate Island, lies within a tectonically active corridor. The earthquake was felt weakly or not at all by local residents due to distance and depth, reducing immediate alarm. However, the Molucca Sea itself hosts one of Earth's most complex plate junctions, where three major tectonic plates converge. The region experiences frequent seismicity; historical records show magnitude 6+ events every 3–5 years. This particular magnitude 5.8 event is intermediate in regional context—strong enough to register on global networks but insufficient to trigger significant damage or hazards.
The Molucca Sea lies at a triple junction where the Pacific Plate, Philippine Sea Plate, and Eurasian Plate collide. Ternate sits on the Philippine Sea Plate, which is actively subducting eastward beneath the Pacific Plate along the Talaud Trough and westward beneath the Eurasian Plate. This configuration creates a complex stress regime, producing both shallow intraslab and deeper Wadati-Benioff zone earthquakes. The magnitude 5.8 event at 49.2 km depth places it within the subducting slab itself—a characteristic intermediate-depth earthquake generated by phase transitions and cold-rock stress release within the descending oceanic lithosphere.
This magnitude 5.8 earthquake released approximately 3.98 × 1016 joules of energy—equivalent to 9.5 megatons of TNT. The moderate depth and subduction-zone setting indicate a rupture occurring within the cold, brittle interior of the descending Pacific Plate rather than along the megathrust interface. Such intraslab events propagate seismic waves efficiently through cooler, denser rock, allowing detection at global distances despite moderate magnitude. The rupture likely spanned 8–12 km in length, with slip concentrated over seconds.
Shallow earthquakes (<30 km) occur on plate boundaries and generate strong ground shaking near the epicentre. Intermediate-depth events (30–300 km) like this one occur within subducting slabs, produce longer-period seismic waves, and cause less structural damage locally but can be felt at continental distances. At 49.2 km, this rupture released energy in the slab rather than the locked zone, minimizing tsunami risk and reducing peak ground acceleration near populated areas.
Ternate and nearby Tidore Island, both population centres in North Maluku Province, experienced weak to imperceptible shaking. The distance of 130 km from the epicentre and moderate depth attenuated ground motion significantly. No casualties, infrastructure damage, or emergency response was required. The lack of a tsunami warning reflects the intraslab rupture mechanism—such events displace little overlying water compared to megathrust earthquakes. Historically, the Molucca Sea has produced several magnitude 6–7 events; the largest recorded was a magnitude 7.3 in 1938. This magnitude 5.8 event is consistent with background seismicity in one of the world's most seismically active maritime zones.