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1968 Casiguran earthquake

Violent earthquake and tsunami in Aurora Province, Philippines

Field	Value
title	1968 Casiguran earthquake
timestamp	1968-08-01 20:19:22
isc-event	817557
anss-url	iscgem817557
local-date
local-time	04:19:22
map	1968 Casiguran earthquake.jpg
map2	{{Location map many	Philippines	relief = 1
label	Casiguran
lat	16.316
long	122.067
mark	Bullseye1.png
marksize	50
position	bottom
width	260
float	none
caption	}}
magnitude	7.6
7.3 Ms
depth	25 km
location
type	Thrust
countries affected	Philippines
tsunami	.3 m
intensity

foreshocks	10+
casualties	207–271 dead, 261 injured
caption	Ruby Tower damage

| isc-event = 817557 | anss-url = iscgem817557 | local-date = | local-time = 04:19:22 7.3 Ms

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.

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. 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. 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.

Aftershocks

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

Aftermath and legacy

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

Notes

References

Sources

References

"Destructive Earthquakes in the Philippines". [[Philippine Institute of Volcanology and Seismology]].
{{harvnb. Su. 1969
Moya, George P.. (July 2, 2014). "When an earthquake hits Metro Manila". Rappler.
Ynares, Dr. Jun. "The Ruby Tower". Manila Bulletin.
Marianne V. Go. (December 14, 2006). "Group warns vs substandard construction materials". The Philippine Star.
"1968 August 02 Ms7.3 Casiguran Earthquake". Philippine Institute of Volcanology and Seismology.
{{harvnb. Su. 1969
(April 27, 2019). "Of Manila Earthquakes and Ruby Tower".
(September 4, 2009). "PAGER-CAT Earthquake Catalog". United States Geological Survey.
(August 1, 1968). "M 7.6 – Luzon, Philippines". United States Geological Survey.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

earthquakes-in-the-philippines 1968-in-the-philippines 1968-earthquakes history-of-aurora-(province) history-of-manila august-1968-in-asia

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