January 25, 2014 Earthquake: Banyumas, Java, Indonesia

At least one building destroyed and several buildings damaged in Banyumas. Felt (V) at Kebumen; (IV) at Bantul, Cilacap, Demak, Garut, Klaten, Magelang, Pangandaran, Pemalang, Purbalingga, Purwokerto, Sewon, Solo, Tasikmalaya and Yogyakarta; (III) at Cirebon and Jakarta. Felt in many parts of Java. Also felt on Christmas Island, Australia.

Kebumen, Jawa Tengah, Indonesia - CDI: 6; Tayu, Jawa Tengah, Indonesia - CDI: 5; Wengon, Jawa Tengah, Indonesia - CDI: 5; Bandung, Jawa Barat, Indonesia - CDI: 5; Yogyakarta, Yogyakarta, Indonesia - CDI: 5

Tectonic Summary

Seismotectonics of the Java Region

The Sunda convergent margin extends for 5,600 km from the Bay of Bengal and the Andaman Sea in the northwest towards Sumba Island in the southeast, and then continues eastward as the Banda arc system. This tectonically active margin is a result of the India and Australia plates converging with and subducting beneath the Sunda plate at a rate of approximately 50 to 70 mm/yr. The main physiographic feature associated with this convergent margin is the Sunda-Java Trench, which stretches for 3,000 km parallel to the Java and Sumatra land masses and terminates at 120° E. The convergence of the Indo-Australia and Sunda plates produces two active volcanic arcs: Sunda, which extends from 105 to 122° E and Banda, which extends from 122 to 128° E. The Sunda arc results solely from relatively simple oceanic plate subduction, while the Banda arc represents the transition from oceanic subduction to continental collision, where a complex, broad deforming zone is found.

(above from reference #13456)

A strong undersea earthquake has rocked parts of Indonesia's main Java island on Saturday, causing some damage, but there were no reports of casualties. The 6.1-magnitude quake was centred 41 kilometres (25 miles) south of Kroya, a town near the southern coast of central Java, with a depth of 83 kilometres (51 miles), the US Geological Survey said. The roof of a mosque collapsed in the town of Banyumas and dozens of houses were reported damaged in surrounding areas but there were no injuries. (reference #10861)