A total of 673 earthquakes shook the Indonesian territory during August 2019. 3 of these, 3 of them produced considerable damage.
As reported by Daryono, Head of the Earthquake and Tsunami Mitigation Agency for Meteorology, Climatology and Geophysics (BMKG), through his Instagram account, the total number of tectonic earthquakes during August 2019 was 673 times.
Earthquakes with a significant magnitude, that is, above 5.0 (M> 5.0), occurred 22 times. Earthquakes whose vibrations were easily perceived were 56. Only 3 of these movements were destructive earthquakes.
The first of these major earthquakes happened on August 2, 2019 in southern Banten, with a magnitude of 6.9 and a recorded damage of 7 houses that extended to the districts of Cianjur, West Bandung and Sukabumi.
The second destructive earthquake occurred in Banyuwangi on August 12, 2019, its magnitude was 5.0 and caused multiple minor damages on the beaches of Pancar and Rajegwesi, in Banyuwangi province.
The third of these strong earthquakes took place on August 23, 2019 on Mount Salak, with a magnitude of 4.0. This earthquake caused damage to the homes of several residents in the Nanggung district of Bogor province.
In addition, during the month of August 2019 there was also a swarm earthquake. It is called "swarm earthquake" to a period of seismic activity, located in a geographical area, where the average magnitude is relatively small but the frequency is very high, that is, there are many tremors but most are mild.
The swarm phenomena in Indonesia have occurred several times: in Klangon Madiun (June 2015), Jailolo Halmahera Barat (December 2015) and Mamasa Sulawesi South (November 2018). During the span of the Madiun swarm earthquake, which occurred on August 3, 2019, there were more than 19 earthquakes per day.
The next swarm earthquake occurred southwest of the foot of Salak Mountain from August 10 to 28, 2019. At least 84 movements were recorded for 18 days. This caused some disturbances and that some people moved to the tea plantations.
In some cases, the swarm occurs in volcanic areas, areas that experience stress fields related to the insistence of magmatic activity. But several reports indicate that swarm activity can also occur in non-volcanic areas, areas with fragile rock characteristics, where it is easy for cracks (fractures) to occur.
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