There Were 20 Aftershocks In Yogyakarta

Screenshot. Earthquake shock map in Bantul, Special Region of Yogyakarta (DIY). (ANTARA/Vicki Febrianto)

JAKARTA - The Meteorology, Climatology and Geophysics Agency (BMKG) recorded 20 aftershocks with strengths ranging from 3.0 to 4.2 magnitudes in Yogyakarta.

"The results of BMKG monitoring until 21.30 WIB show that there were 20 aftershocks with a magnitude ranging from 3.0 to 4.2," said BMKG Head Dwikorita Karnawati as reported by ANTARA, Friday, June 30.

Dwikorita said that previously there had been an earthquake centered in the Indian Ocean region south of the Special Region of Yogyakarta at 19.57 WIB.

BMKG initially recorded the earthquake measuring 6.4 magnitude and a depth of 25 kilometers, then its strength was updated to 6.0 magnitude with a depth of 67 kilometers.

If you pay attention to the location of the epicenter and the depth of the hypocenter, then the earthquake that occurred was a medium earthquake due to subduction activity or collision of the Indo-Australian Plate or the Indian Ocean Plate which fell under the Eurasian plate.

"The results of the analysis of the source mechanism show that this earthquake has an upward movement mechanism or an up fault," said Dwikorita.

The earthquake was felt by people living in a number of areas, namely the MMI IV scale in Bantul, Tulungagung, Nganjuk, Kebumen, Ponorogo, Pacitan, and Trenggalek.

The intensity scale III to IV MMI is also felt in Karangkates, Klaten, Kediri, Kulon Progo, and Wonogiri.

The intensity scale III was felt by residents living in Banjarnegara, Purbalingga, Purwokerto, Mojokerto, Pacitan, Gresik, Malang, Salatiga, and Jepara. The intensity scale of II to III MMI was felt to reach the Lumajang, Ngawi, Blora, and Bandung areas.

According to MMI's IV scale BMKG literacy, earthquake vibrations are categorized as light and can be felt by many people in the house and make windows and doors row.

On the MMI III scale, the earthquake was classified as weak, only causing vibrations inside the house, such as a truck passing by, while on the MMI II scale, vibrations were felt by several people and light objects that were hung swayed.

Meanwhile, the National Disaster Management Agency (BNPB) noted that several infrastructures were damaged by the earthquake, including 15 houses damaged, one government facility, one health facility, and two educational facilities.

The damaged buildings are scattered in Gunungkidul, Bantul, and Kulon Progo Regencies.