The earth rumbles and the ground shakes, our houses move, and buildings sway. These are earthquakes that occur all around the world, although they tend to occur in some places more than others.
The Philippines is one such location, and our country is no stranger to earthquakes. Just ask the people of Bohol, who were around 8:12 am on October 15, 2013, or the people of Negros Oriental, who were around 11:49 am on February 6, 2012. These were devastating earthquakes that took away lives and cost millions of pesos in damage.
The 2013 Bohol Earthquake source:https://en.wikipedia.org/wiki/2013_Bohol_earthquake
And these earthquakes were caused by extensive cracks along the ground called “faults” or “faultlines.” The 2013 M7.2 Bohol Earthquake was caused by the North Bohol Fault, and the 2012 M6.7 Negros Oriental Earthquake was caused by a previously unknown fault.
This begs the question, if Negros Oriental and Bohol have fault lines, does that mean that Cebu also has fault lines? Yes, but that should not be the reason for panic.
Mendoza et al. investigated the potentially active Central Cebu Fault System or CCFS, looking into the specifics of these fault lines, and most interestingly, the largest possible earthquakes they can generate.
In the mountainous portions of Cebu, the CCFS is composed of four fault lines from North to South: the Balamban Fault, the Central Highland Fault, the Uling-Masaba Fault, and the Lutac-Jaclupan Fault. The Uling-Masaba Fault is the most interesting/concerning because, according to the paper, the strongest earthquake it can potentially generate is an M7.1 earthquake which was comparable to the M7.2 earthquake of Bohol in 2013. The Lutac-Jaclupan fault can also potentially generate an M6.9 earthquake, stronger than the M6.7 earthquake of Negros Oriental in 2012.
According to this paper, most earthquake catalogs, both from PHIVOLCS and from international agencies, do not show any earthquakes in the past that register an M5.5+ earthquake that occurred on the CCFS. This is why they classify the CCFS as potentially active because there is a lack of earthquakes in the areas occupied by the CCFS.
Regardless of whether the CCFS can generate a strong earthquake, it is best that we are prepared. Knowing what to do during and after an earthquake, having an earthquake plan and an evacuation plan ready, and having lots of water and non-perishable foods readily available for consumption are a few things that we can do in order to ensure our survival in case of an earthquake, or really any disaster.
ABOUT THE AUTHOR
Reinz Bill Dugan
"My eyes are up in the clouds, and I think it’s gonna rain."
- Natural Disasters Enthusiast
- Amateur Music Producer