Responding to the earthquake with magnitude 5.9 at a depth of 32 km on Saturday morning (May 18, 2019), the Center for Volcanology and Geological Disaster Mitigation (PVMBG) reported that the geological conditions of the earthquake affected area in the Pangandaran Regency and its surroundings, which were the closest area to the location of the epicenter, composed of Quaternary deposits and rocks of Tertiary age in the form of sedimentary rocks and volcanic rocks where some of the Tertiary rocks have undergone weathering.
Quaternary deposits and tertiary rocks that have undergone weathering are soft, decomposed, loose, not yet compact (unconsolidated) and strengthen the effects of shocks, making them prone to earthquake shocks.
Whereas if viewed based on the location and depth of the epicenter, according to PVMBG, the earthquake event is caused by subduction activities in the megathrust zone.
The earthquake that occurred at around 08.51 WIB did not cause a tsunami, because it was not expected to occur underwater dislocation.
This earthquake was recorded and felt at Mount Galunggung PGA Post on the scale of II - III MMI. Earthquake shocks were felt in the areas of Pangandaran, Tasikmalaya, Cilacap, Banyumas, Karangkates, Blitar, Tulungagung and Kediri on the scale of MMI II-III.
Furthermore, the PVMBG appealed to the community to remain calm and follow directions and information from government officials and the local BPPD.
The community was also asked not to be provoked by irresponsible issues regarding the earthquake and tsunami.
Even so, the people affected by the earthquake were asked to remain vigilant about the occurrence of aftershocks, which are estimated to be of smaller magnitude.