2012 Visayas earthquake

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2012 Visayas earthquake
2012 Visayas earthquake is located in Visayas
2012 Visayas earthquake
2012 Visayas earthquake is located in Philippines
2012 Visayas earthquake
UTC time ??
ISC event
USGS-ANSS
Date * February 6, 2012 (2012-02-06)
Origin time * 11:49:11 PST[1]
Local date
Local time
Magnitude 6.9 Mb[1]
Depth 10 km[1]
Epicenter 9°58′N 123°08′E / 9.97°N 123.14°E / 9.97; 123.14Coordinates: 9°58′N 123°08′E / 9.97°N 123.14°E / 9.97; 123.14[1]
Type Blind thrust
Areas affected Philippines (Negros Oriental, Negros Occidental and Cebu)
Total damage Structural collapse, landslides
Max. intensity PEIS – VII (Destructive)[2]
Tsunami Yes
Landslides Yes
Aftershocks 1600+ (as of February 7, 2012, 7:45 PST)[3]
Casualties 51 dead[4][5]
112 injured
62 missing
Deprecated  See documentation.

The 2012 Visayas earthquake occurred on February 6 at 11:49 PST with a body wave magnitude of 6.7 and a maximum intensity of VII (Destructive) off the coast of Negros Oriental, Philippines. The epicenter of the submarine blind thrust earthquake was approximately 72 kilometres (45 mi) north of the provincial capital of Dumaguete City.[6][7][8]

Earthquake

Recorded intensities according to the PHIVOLCS Earthquake Intensity Scale (PEIS) were 7 in Dumaguete and V (PEIS) in Cebu.[9] The earthquake was felt as far as Mindanao in the provinces of Misamis and Lanao and as far as Iligan.[10]

Geology

The Philippines lies within the Pacific Ring of Fire, which causes the archipelago to have frequent volcanic and seismic activity. The earthquake to hit Negros happened in 1948, but did not cause damage.[11]

According to PHIVOLCS, the earthquake was caused by movement on a previously undiscovered fault.[12] However, according to an Environmental Sciences professor, this fault was already known to private geologists hired by the Negros Occidental government to create a land use map for the province.[13]

Tsunami warning

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) gave a level two tsunami alert, indicating that the public should be on watch for "unusual waves", but did not call for any evacuation. Despite this, in Cebu City, panic erupts and many residents fled towards higher ground due to rumors that a tsunami had hit the coastal villages of Ermita, Mambaling and Pasil. Residents of Dumaguete also scrambled to the mountain town of Valencia because of the scare. These rumors were later confirmed to be false. PHIVOLCS announced the tsunami alert at 14:30 PST, but there was no tsunami.[11]

Damage and effects

USGS ShakeMap

The degree and extent of damage caused by the earthquake were significant, with most of the damage sustained during the initial earthquake. The hardest hit were the towns of Tayasan, Jimalalud, La Libertad, and the city of Guihulngan, in Negros Oriental. Several houses and buildings collapsed, while others sustained damage. The earthquake also triggered numerous landslides which buried houses and people. Reported places where landslides occurred are Barangay Solongon, La Libertad and Planas, Guihulngan.[9][11]

Telecommunication services were disrupted after the earthquake.[14]

Water

Several places were cut off, notably the isolated remote towns. Guihulngan, one of the cities and towns affected by the earthquake, suffered extensive damage. Its water services, along with electricity and telecommunications, were reported to be cut off.[15]

Electricity

After the initial earthquake, the power supply was suddenly cut off in affected areas after power lines were damaged. Power plants in Visayas tripped or shut down following the earthquake, although no major damage was sustained in transmission facilities. On February 8, power was restored in some areas.[3]

Transport

The transport network of some parts of Cebu and Negros Oriental suffered severe disruptions. Main arteries were damaged, although automobiles and people can still pass through damaged roads. A small number of roads, especially in the mountainous territories, were likely to be destroyed. A total of three roads and ten bridges were destroyed.[16] Because of damage of roads and bridges, access to some remote villages was cut off.[17] Most of the damage happened in north Negros Oriental, which is more mountainous than the rest of Negros Oriental.[11]

Cultural and governmental properties

Among the properties destroyed by the earthquake are the public market and the courthouse of Guihulngan. The Aglipay Church in La Libertad also collapsed.[18]

See also

References

  1. ^ a b c d "Earthquake Bulletin No. 4: 6.9 Negros Earthquake". Philippine Institute of Volcanology and Seismology. February 6, 2012. Retrieved August 31, 2017. 
  2. ^ "2012 Earthquake Bulletins". Interaksyon. February 2012. Retrieved February 6, 2012. 
  3. ^ a b Elias O. Baquero; Kevin A. Lagunda; Rebelander S. Basilan (February 8, 2012). "Phivolcs 7: Tsunami warning correct; sees more aftershocks". Sun.Star Cebu. Retrieved February 8, 2012. 
  4. ^ USGS Deaths From Earthquakes in 2012 Archived March 27, 2013, at the Wayback Machine.
  5. ^ "Quake's death toll breaches 100". Gulf News. February 10, 2012. Retrieved February 10, 2012. 
  6. ^ "Strong quake jolts Negros-Cebu; fatalities rising". ABS-CBN News and Current Affairs. February 6, 2012. Retrieved February 6, 2012. 
  7. ^ Ellalyn B. De Vera; Elena L. Aben; Mars W. Mosqueda Jr. (February 6, 2012). "Quake Jolts Visayas". Manila Bulletin. Archived from the original on February 9, 2012. Retrieved February 6, 2012. 
  8. ^ "Magnitude 6.7 – NEGROS – CEBU REGION, PHILIPPINES". United States Geological Survey. February 6, 2012. Archived from the original on February 9, 2012. Retrieved February 28, 2012. 
  9. ^ a b Jun Pasaylo; Dennis Carcamo (February 7, 2012). "Death toll in Visayas quake continues to rise". The Philippine Star. Retrieved February 7, 2012. 
  10. ^ Abigail Kwok; Joseph Ubalde; Lira Dalangin-Fernandez (February 6, 2012). "Number of casualties rises as 6.7 quake strikes off Negros". Philippine Institute of Volcanology and Seismology. Archived from the original on February 9, 2012. Retrieved February 7, 2012. 
  11. ^ a b c d Virgil Lopez (February 7, 2012). "Quake toll rising but no deaths in Cebu". Sun.Star Cebu. Retrieved February 7, 2012. 
  12. ^ Hernandez, Zen (7 February 2012). "Phivolcs probes new Negros fault line". ABS-CBN News. Retrieved 12 February 2012. 
  13. ^ BAP/JKV (11 February 2012). "Negros fault line discovered since 2008". Sun.Star Cebu. Retrieved 12 February 2012. 
  14. ^ "Strong earthquake jolts Visayas; 43 reported dead". BWorldOnline.com. February 6, 2012. Retrieved February 8, 2012. 
  15. ^ "Quake Deaths Rise". Manila Bulletin. February 7, 2012. Retrieved February 8, 2012. 
  16. ^ "3 roads, 10 bridges in Visayas impassable after quake; damage estimated at P265.76M". GMA News and Public Affairs. February 9, 2012. Retrieved February 9, 2012. 
  17. ^ "Rescuers search for missing after Philippine quake". Reuters. February 7, 2012. Retrieved February 8, 2012. 
  18. ^ "Number of casualties rises as 6.9 quake strikes off Negros". Manila Bulletin. February 7, 2012. Retrieved February 6, 2012. 

External links

  • The International Seismological Centre has a bibliography and/or authoritative data for this event.
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