![[ANALYSIS] June 15's magnitude 6.3 deep-focus Calatagan earthquake](https://i.headtopics.com/images/2023/6/15/rapplerdotcom/analysis-june-15-s-magnitude-6-3-deep-focus-calata-analysis-june-15-s-magnitude-6-3-deep-focus-calata-1669309570567503872.webp)
Two earthquakes of the same magnitude can cause varying degrees of damage to infrastructure. A deep focal source is expected to inflict less damage than a shallow one.
At 10:19 this morning, I just settled parking when the car started shaking slightly sideways. As I looked around to check if somebody was leaning on the fenders to check the source of the shaking – I found no one – I received an earthquake alert on my mobile phone within about 3 to 4 seconds into the shaking. In the next 20 seconds or so, the car shook more vigorously, then waned a few more seconds later – intensity IV, I thought.
Similarly, on February 15, 2003, an earthquake of the same magnitude 6.3 struck the island of Masbate in the central Philippines and caused significant infrastructure damage and ground deformation, including a surfacesliced into two about its axis. Interestingly, this same coconut tree was sliced anew after 17 years by the same fault during the magnitude 6.6 Masbate earthquake of August 18, 2020, which is quite a rarity in earthquake dynamics.
The Batangas earthquake was generated by the rupturing of a fault located more than 100 kilometers deep into the asthenosphere, while the Zambales and Masbate earthquakes were generated by a fault source located at much shallower depths within the crust. Two earthquakes of the same magnitude can cause varying degrees of damage to infrastructure.
In the Philippines, there are six subduction trenches that are capable of generating earthquakes of similar or even greater magnitudes. Surrounding the entire archipelago with the exception of Palawan Island, these trenches are found west of Luzon , west of Negros Island , west of Zamboanga Peninsula , west of Mindanao , east of Bicol to Mindanao , and east of Luzon .
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