The world's central earthquake and tsunami agency banda, climatology and geophysics (BMKG) daryono said that the magnitude of the earthquake that struck Cianjur, west Java, on Monday (21/11/2022) at noon was actually not that big.
However, those 5.6 magnitude quakes cause significant damage because of a shallow crust tectonic or shallow crustal earthquake.
"The characteristics of the shallow crustal earthquake are very shallow. So the energy from a broadcast center, radiating to the ground is still strong," says daryono in a TV compass show, Tuesday (22/11/2022).
Furthermore, says daryono, structural structures in the affected region do not meet earthquake - proof standards. Countless homes have been built without regard for the safety of earthquakes because of the use of rebar or standard cement.
The location of the settlement in the soft soil area also causes the resonant of the earthquake waves that eventually amplify or amplify the impact of the tremor.
Moreover, in the foothills or slopes, inhabitants suffered severe damage because the area's topography was unstable.
"Although the quake did not actually kill and maw, an earthquake that failed to respond to the safety of an earthquake that then collapsed on the occupant was a cause of death and injury," says daryono.
Furthermore, the daryono explained that the cesarean quake was triggered by the cesarean movement. In history, areas around the cesarean cimandiri have been shaken by earthquakes, including powerful ones.
Some of the devastating effects were by 1844, 1879, 1910, and 1912. Then, since the use of seismograph, 1969, there were 5.4 magnitudo quakes in the region that caused many casualties and damage. Then, in 1982 there were 5.5 magnitudo quakes with 7 injured and many homes damaged.
Then, in July 2000, a magnitude 5.4 and 5.1 tremor caused more than 1,900 homes to be damaged. Thereafter, there were several major quakes up to the latest on November 21, 2022, with devastating effects.