1968 Casiguran earthquake

1968 Casiguran earthquake
1968 Casiguran earthquake.jpg
UTC time 1968-08-01 20:19:22
ISC event 817557
USGS-ANSS ComCat
Local date August 2, 1968 (1968-08-02)
Local time 04:19:22
Magnitude 7.3 Mw[1]
Depth 25 km (16 mi)[1]
Epicenter 16°18′58″N 122°04′01″E / 16.316°N 122.067°E / 16.316; 122.067Coordinates: 16°18′58″N 122°04′01″E / 16.316°N 122.067°E / 16.316; 122.067[1]
Type Thrust[2]
Areas affected Philippines
Max. intensity IX (Violent)[citation needed]PEIS – VIII (Very Destructive) [3]
Tsunami .3 m (1 ft 0 in)[4]
Foreshocks 10+[2]
Casualties 207–271 dead, 261 injured [4]

The 1968 Casiguran earthquake occurred on 04:19:22 local time on August 2 with a moment magnitude of 7.3 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.[5][a] 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 use of low-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.

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

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