A magnitude 5.2 earthquake occurred on the morning of September 14 in the waters southeast of Malang Regency, East Java, Indonesia.
The epicenter was at sea, approximately 156 km southeast of Malang Regency, and the reported depth was 10 km.
Although it was an offshore earthquake, Indonesia’s Meteorology, Climatology, and Geophysical Agency (BMKG) stated that there was no tsunami potential.
3-Line Summary
1. M5.2 earthquake near Malang Regency on September 14
2. The epicenter was in the waters 156 km southeast
3. Authorities announced that there was no tsunami potential
Earthquake Recorded at 8:42:08 a.m.
BMKG announced that a magnitude 5.2 earthquake occurred at 8:42:08 a.m. Western Indonesian Time (WIB) on September 14. detikNews and Harianjogja.com both reported the time and magnitude, stating that the epicenter was approximately 156 km southeast of Malang Regency, East Java.
The reported coordinates were 9.52° south latitude and 112.85° east longitude. The center of the earthquake was not on the land of Malang Regency but at sea, and its depth was given as 10 km. Radar Malang also reported the offshore location southeast of Malang Regency and the 10 km depth in its headline.
Here, “156 km southeast of Malang Regency” refers to the distance from Malang Regency to the epicenter. It should be distinguished from wording suggesting that the earthquake occurred in downtown Malang Regency or on land.
BMKG: “No Tsunami Potential”
BMKG announced that this earthquake had no potential to cause a tsunami. The official information cited by Harianjogja.com also stated that there was “no tsunami potential,” and the report said that no tsunami warning was issued based on this announcement.
A tsunami assessment is not determined solely by the fact that an earthquake occurred at sea. In this case, the official determination confirmed along with the initial analysis values—magnitude 5.2, depth 10 km, and location in the waters southeast of Malang Regency—was “no tsunami potential.”
BMKG advised people to remain cautious because aftershocks could occur following the earthquake. This was guidance to prepare for the possibility of aftershocks, not an announcement that aftershocks had occurred. Within the scope of the reports, casualties, building damage, and whether any actual aftershocks occurred had not been confirmed.
The most important distinction in understanding this earthquake is between the location information indicating an offshore epicenter and the official announcement that there was no tsunami potential. The two pieces of information are separate, but both are essential to assessing the risk posed by this earthquake.
References
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