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Strong mag. 6.1 earthquake - 29 km southwest of ollong-gapo, Province of Zambales, Central Luzon, Philippines, on Sunday, August 23, 1998 at 05:36 GMT

Strong mag. 6.1 earthquake - 29 km southwest of ollong-gapo, Province of Zambales, Central Luzon, Philippines, on Sunday, August 23, 1998 at 05:36 GMT

Strong magnitude 6.1 earthquake at 70 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Aug 23, 1998 05:36:12 UTC
Magnitude: 6.1
Depth: 70.1 km
Epicenter latitude / longitude: 14.697°N / 120.046°E (South China Sea, Philippines)
Antipode: 14.697°S / 59.954°W
Nearest volcano: Natib (38 km / 24 mi)
Nearby towns and cities:
24 km (15 mi) W of Morong (Bataan) (pop: 16,100) --> See nearby quakes!
28 km (17 mi) S of San Antonio (Zambales) (pop: 34,200) --> See nearby quakes!
28 km (18 mi) SW of Subic (pop: 67,700) --> See nearby quakes!
29 km (18 mi) WSW of ollong-gapo (pop: 221,200) --> See nearby quakes!
31 km (19 mi) SSW of Castillejos (Zambales) (pop: 27,300) --> See nearby quakes!
33 km (21 mi) SSW of San Marcelino (Zambales) (pop: 18,700) --> See nearby quakes!
48 km (30 mi) WSW of Dinalupihan (pop: 66,700) --> See nearby quakes!
56 km (35 mi) WNW of Mariveles (pop: 84,600) --> See nearby quakes!
101 km (63 mi) W of Manila (pop: 1,600,000) --> See nearby quakes!
108 km (67 mi) W of Quezon City (pop: 2,761,700) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 8.9 x 1013 joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 atomic bombs!) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
6.170 kmLuzon, PhilippinesUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
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Aftershocks

[More info]

Recorded aftershocks, latest first (3 quakes)

Date and timeMag
Depth		LocationDetails
Dec 25, 1998 03:12
23 years ago
4.2

140 km		1.9 km NE of ollong-gapo, Province of Zambales, Central Luzon, PhilippinesMore
Oct 21, 1998 03:18
24 years ago
4.9

76 km		45 km SW of ollong-gapo, Province of Zambales, Central Luzon, PhilippinesMore
Aug 31, 1998 19:16
24 years ago
5.4

68 km		8.2 km NW of Subic, Province of Zambales, Central Luzon, PhilippinesMore

Earlier earthquakes in the same area

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