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Earthquake risk in Sabah (a free peer review)

posted Sep 6, 2021, 7:44 AM by jeffery jim
This is based on one particular journal I am reading now which shows the geohazard and risk for all district within Sabah. I will not say any of this information is wrong or misleading since this is analyzed using geostatistic via ArcMap.

As a person who understand geotechnics, geology as well as structural design, this does not entail entirely the available consequence based on engineering philosophy when we are discussing about subject that matters.

Based on tabulated data given, the worst area is Tongod with risk surpasses Ranau by three folds. The reason is likely based on the weightage provided on active fault lines (Perancangan, Danum and Binuang) and the geology of the location.

Nevertheless, based on actual case, Lahad Datu and Darvel Bay locality have higher risk, especially Lahad Datu Fault Line which triggered a few devastative earthquakes up to 5.6 Richter Scale.

Similar to Ranau, it is a hot spot for earthquakes and shockwaves which dreadfully triggered a magnitude 6.0 earthquake few years back with many inactive fault lines and a few highly active fault lines - Labou-Labou, Kedamaian, Mamut and Mensaban Fault Lines.

The use of single weightage by placing PGA values and weighted at 0.33 for each interval (almost ordinal) of risk level may not be accurate where seismic risk depends very much on the geological issues such as the formation as well as geological deposits apart from pedological parameters for engineering interpretation which meets the engineering philosophy.

The map rendered is almost similar to the map produced for the purpose of reference in MS EN 1998-1-1 which were produced hastily in my opinion without considering the true nature of chaotic soil of the east coast as well as the geological formation involving soft soil or almost argillaceous with lax of proper matrices within.