Open AccessLiquefaction and normal fault in Talise Valangguni and Tanamodindi Villages of Palu City; a preliminary observation of impact MW 7.5 earthquake in 2018 at Central Sulawesi Province, Indonesia
Author(s) -
Mir Azam Khan,
Ahmad Imam Abdullah
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1763/1/012077
Subject(s) - liquefaction , geology , seismology , seismic hazard , fault (geology) , quake (natural phenomenon) , hydrogeology , geotechnical engineering
Talise Valangguni and Tanamodindi Village are among the areas that affected by 28 September 2018 earthquake. This fact-based on our findings about ground surface deformation, the liquefaction and normal fault surface rupture effect. We then make further observations to record the existing hazard characteristics and delineate the affected area to see the hazards configuration to geological factors. The results showed there were 5 liquefaction areas with about 0.13-1.29 km 2 . The liquefaction effect characteristics that we found are fracture, downlift-uplift, wavy surface, sudden stagnant water, and lateral spreading. Liquefaction sites in this area are identical in seasonal river routes and strongly influenced by lithological, hydrogeological, and earthquake. The sediment deposits are dominated by saturated sand, which can experience significant infiltration, worsening the soil strength size. As a result, this area is susceptible to liquefaction effects when strong earthquakes occur. Meanwhile, normal faults are ± 1.5 km long, oriented west-east, where the southern block has decreased between 5-30 cm. We suspect that this fault existed before the earthquake and appear on the surface after the quake, contributed by shocks and gravity. We hope that this information can be used as a reference for spatial planning for Palu City in disaster mitigation.