Notes on the Negros-Cebu quake of 6 Feb 2012

Death toll in Visayas quake rises to 7; 29 missing (www.philstar.com)

The Philippine Institute of Volcanology and Seismology (Philvolcs) measured the earthquake at magnitude-6.9. It said the quake, which was tectonic in origin, occurred in waters off Tayasan town in Negros Oriental at 11:49 a.m. with a depth of 10 kilometers.

The agency reported that the strong quake was followed by more than 40 aftershocks as of 2 p.m. The two strongest aftershocks were measured at magnitudes 4.8 and and 5.3.

The quake was felt strongest at Intensity 7 in Dumaguete City and Vallehermoso town in Negros Oriental. It was also felt at Intensity 6 inLa Carlota City and La Castellana towns in Negros Oriental and Argao town in Cebu province.

In the Phivolcs Earthquake Intensity Scale (PEIS), Intensity 7 was described as “destructive.” It said that during an Intensity 7 quake, people in upper floors may find it difficult to stand and heavy objects and furniture may overturn or topple…

The areas of Roxas City; Dao and Ivisan in Capiz; Iloilo City; Ayungon town in Negros Oriental; Kanlaon City; Lapu-lapu City; Guimaras; Cebu City; San Carlos City; Bacolod City; Sagay City; Tagbilaran City; Candoni and Binalbagan towns Negros Occidental felt the quake at Intensity 5.

The quake was also felt at Intensity 4 in San Jose de Buenavista, Pandan, Anini-y, Patnungon towns in Antique; Kalibo in Aklan province, Dipolog City, Sipalay in Negros Occidental and Ormoc City.

It was also felt at Intensity 3 in Butuan City in Agusan del Norte; Legaspi City, Albay; Carmen, Cagayan de Oro; Tacloban City; Catbalogan; Saint Bernard, Southern Leyte; Masbate, Masbate; Cagayan de Oro City; Intensity 2 in Cabid-an, Sorsogon; Borongan, Eastern Samar; Mambajao, Camiguin and Intensity 1 in Pagadian City.

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Physics News and Features from Ateneo de Manila University

3 Responses to Notes on the Negros-Cebu quake of 6 Feb 2012

  1. Mariecel Villarin says:

    How about here in Tayasan what is the intensity we felt on feb.6?

    • Hi Mariecel,

      This is from Phivolcs http://www.phivolcs.dost.gov.ph/html/update_SOEPD/EQLatest.html:

      06 Feb 2012 – 08:29 PM 09.94 123.01 014 3.8 017 km N 85° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 07:40 PM 10.02 123.03 017 4.2 018 km N 57° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 07:33 PM 10.00 123.15 001 4.8 008 km N 14° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 06:10 PM 09.93 123.15 007 6.2 002 km N 77° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 05:18 PM 09.90 123.17 001 2.8 003 km S 3° E of Tayasan (Negros Oriental)
      06 Feb 2012 – 04:50 PM 09.97 123.16 006 2.7 004 km N 14° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 04:37 PM 09.85 123.22 010 3.6 010 km S 32° E of Tayasan (Negros Oriental)
      06 Feb 2012 – 03:27 PM 10.02 123.12 024 2.0 011 km N 30° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 03:04 PM 10.10 123.22 019 3.8 013 km N 16° E of Tayasan (Negros Oriental)
      06 Feb 2012 – 12:20 PM 10.15 123.12 019 5.3 025 km N 13° W of Tayasan (Negros Oriental)
      06 Feb 2012 – 12:03 PM 10.10 123.23 024 4.8 020 km N 18° E of Tayasan (Negros Oriental)
      06 Feb 2012 – 11:49 AM 09.97 123.14 010 6.9 005 km N 41° W of Tayasan (Negros Oriental)

      You had a 6.2 and 6.9 magnitude quakes last Feb 6.

  2. This is an unexpected tragedy; there are many people who are victims of this tragedy. We hope and pray that they cannot happen again.

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