1968_Casiguran_earthquake

1968 Casiguran earthquake

1968 Casiguran earthquake

Violent earthquake and tsunami in Aurora Province, Philippines

The 1968 Casiguran earthquake occurred on 04:19:22 local time on August 2 with a moment magnitude of 7.6 and a maximum Mercalli intensity of IX (Violent). The thrust earthquake's epicenter was in Casiguran, Quezon (now part of Aurora province). A small non-destructive tsunami was generated and at least 207 people were killed. The majority of the deaths occurred in the collapse of a six-story building in Manila.

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Damage

In Manila, many structures that suffered severe damage had been built near the mouth of the Pasig River on huge alluvial deposits. A number of buildings were damaged beyond repair while others only suffered cosmetic damage. 268 people were reported to have died during the collapse of the six-story Ruby Tower, located at the corner of Doroteo Jose and Teodora Alonzo Streets in the district of Santa Cruz.[5][lower-alpha 1] The entire building, save for a portion of the first and second floors at its northern end, was destroyed. Allegations of poor design and construction, as well as the use of poor-quality building materials arose.[7] In the district of Santa Ana, one person was injured by debris from a damaged apartment building. Two more people from Aurora sub province and Pampanga died as a direct result of the quake. Around the town of Casiguran, there were several reports of landslides, the most destructive one at Casiguran Bay.[citation needed]

Aftershocks

The aftershock sequence throughout the month of August included many moderate shocks, including fifteen over 5.0 mb. The strongest of these occurred on August 3 with a 5.9 Ms event that produced intensities of III–IV in Manila.[8]

Aftermath and legacy

The former location of Ruby Tower in Santa Cruz district is now a memorial hall which stands today.[7][9]

See also

Notes

  1. Some sources put the location of the site of Ruby Tower in Binondo, also in the same city.[6]

References

  1. [1]
    "M 7.6 - Luzon, Philippines". United States Geological Survey. August 1, 1968. Retrieved August 27, 2017.
  2. [2]
    "Destructive Earthquakes in the Philippines". phivolcs.dost.gov.ph. PHIVOLCS. Retrieved October 17, 2021.
  3. [3]
    Su 1969, p. 459
  4. [4]
    USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey
  5. [5]
    Moya, George P. (July 2, 2014). "When an earthquake hits Metro Manila". Rappler. Retrieved September 23, 2020.
  6. [6]
    Ynares, Dr. Jun. "The Ruby Tower". Manila Bulletin. Retrieved September 23, 2020.
  7. [7]
    Marianne V. Go (December 14, 2006). "Group warns vs substandard construction materials". The Philippine Star. Retrieved September 1, 2012.
  8. [8]
    Su 1969, pp. 465–468
  9. [9]
    "Of Manila Earthquakes and Ruby Tower". The Urban Roamer. April 27, 2019. Retrieved September 23, 2020.

Sources
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