Moderate earthquake at intermediate depth below San Juan, Luzon, Philippines

Last update: June 14, 2013 at 5:43 pm by By

Update 17:36 UTC : PHIVOLCS report a somewhat different picture mentioning a Magnitude of M4.9 at a depth of 26 km. A little more dangerous, especially for landslides.
Phivolcs does not expect damage and/or aftershocks. They are reporting an Intensity II at - Laoag City; Sarat, Ilocos Norte; Santa, Ilocos Sur and Baguio City. is a little more sceptical about this earthquake. Based on the Phivolcs data (preliminary of course) we would not be surprised that minor damage has occurred.
Phivolcs puts the epicenter right on the coastline vs more inland by USGS. It will take a little more time before seismologists have manually recalculated the data.

Image courtesy Phivolcs, Philippines

Image courtesy Phivolcs, Philippines

Update 17:35 UTC : The earthquake occurred at 1 AM when most people went to bed. Many of them will not have felt the shaking.

USGS reports a depth of 56 km (preliminary data) which makes this earthquake to be felt in a rather wide area (hundreds of km) but we are convinced that due to the depth this earthquake will not generate any damage.

Screen Shot 2013-06-14 at 19.33.13

0km (0mi) S of San Juan, Philippines
14km (9mi) NE of Bangued, Philippines
37km (23mi) ENE of Bantay, Philippines
38km (24mi) ENE of Vigan, Philippines
340km (211mi) N of Manila, Philippines

Most important Earthquake Data:

Magnitude : 4.9

Local Time (conversion only below land) : 2013-06-15 01:00:24

GMT/UTC Time : 2013-06-14 17:00:24

Depth (Hypocenter)  : 60 km

Depth and Magnitude updates in the list below.

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SRC Location UTC Date/time M D INFO
USGS Luzon, Philippines Jun 14 17:00 4.8 56 MAP I Felt It
EMSC Luzon, Philippines Jun 14 17:00 4.9 60 MAP I Felt It INFO
GEOFON Luzon, Philippines Jun 14 17:00 4.8 46 MAP I Felt It
  • Ayusan Norte, Vigan City - About 1am this morning we awaken in the strong shaking... we were terrified.
  • Candon City - i was surprised onthe second floor when i felt
  • San Vicente, Vigan area - awoken by sudden jolt and about 10 secs of strong shaking. No aftershocks
  • Vigan City, Ilocos Sur - I just embraced my son very tight, the shaking was really strong that it woke me up, it was really terrifying!
  • Baguio City - It lasted for about 5-10 seconds. I felt it around 1AM




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    City/Village where you felt the earthquake
    Street or suburb (area) where you felt the earthquake
    Latitude (area) where you felt the earthquake
    Longitude (area) where you felt the earthquake
    MMI II (Very weak shaking) ?
    People :
    Felt by persons at rest, on upper floors or favorably placed.
    MMI III (Weak shaking) ?
    People :
    Felt indoors; hanging objects may swing, vibration similar to passing of light trucks, duration may be estimated, may not be recognized as an earthquake.
    MMI IV (Light shaking) ?
    People :
    Generally noticed indoors but not outside. Light sleepers may be awakened. Vibration may be likened to the passing of heavy traffic, or to the jolt of a heavy object falling or striking the building.
    Fittings :
    Doors and windows rattle. Glassware and crockery rattle. Liquids in open vessels may be slightly disturbed. Standing motorcars may rock.
    Structures :
    Walls and frames of buildings, and partitions and suspended ceilings in commercial buildings, may be heard to creak.
    MMI V (Moderate shaking) ?
    People :
    Generally felt outside, and by almost everyone indoors. Most sleepers awakened. A few people alarmed.
    Fittings :
    Small unstable objects are displaced or upset. Some glassware and crockery may be broken. Hanging pictures knock against the wall. Open doors may swing. Cupboard doors secured by magnetic catches may open. Pendulum clocks stop, start, or change rate.
    Structures :
    Some large display windows cracked. A few earthenware toilet fixtures cracked.
    MMI VI (Strong shaking) ?
    People Felt by all. People and animals alarmed. Many run outside. Difficulty experienced in walking steadily.
    Fittings :
    Objects fall from shelves. Pictures fall from walls. Some furniture moved on smooth floors, some unsecured free-standing fireplaces moved. Glassware and crockery broken. Very unstable furniture overturned. Small church and school bells ring. Appliances move on bench or table tops. Filing cabinets or "easy glide" drawers may open (or shut).
    Structures :
    Slight damage to buildings with low standard. Some stucco or cement plaster falls. Large display windows broken. Damage to a few weak domestic chimneys, some may fall.
    Environment :
    Trees and bushes shake, or are heard to rustle. Loose material may be dislodged from sloping ground, e.g. existing slides, talus slopes, shingle slides.
    MMI VII (Very strong shaking) ?
    General alarm. Difficulty experienced in standing. Noticed by motorcar drivers who may stop.
    Fittings :
    Large bells ring. Furniture moves on smooth floors, may move on carpeted floors. Substantial damage to fragile contents of buildings.
    Structures :
    Unreinforced stone and brick walls cracked. Low standard buildings cracked with some minor masonry falls. A few instances of damage to buildings of ordinary workmanship. Unbraced parapets, unbraced brick gables, and architectural ornaments fall. Roofing tiles, especially ridge tiles may be dislodged. Many unreinforced domestic chimneys damaged, often falling from roof-line. Water tanks Type I burst. A few instances of damage to brick veneers and plaster or cement-based linings. Unrestrained water cylinders (hot-water cylinders) may move and leak. Some common windows cracked. Suspended ceilings damaged.
    Environment :
    Water made turbid by stirred up mud. Small slides such as falls of sand and gravel banks, and small rock-falls from steep slopes and cuttings. Instances of settlement of unconsolidated or wet, or weak soils. Some fine cracks appear in sloping ground. A few instances of liquefaction (i.e. small water and sand ejections).
    MMI VIII (Severe shaking) ?
    People Alarm may approach panic. Steering of motorcars greatly affected. Structures : Low standard buildings heavily damaged, some collapse. ordinary workmanship buildings damaged, some with partial collapse. Reinforced masonry or concrete buildings damaged in some cases. A few instances of damage to buildings and bridges designed and built to resist earthquakes. Monuments and pre-1976 elevated tanks and factory stacks twisted or brought down. Some pre-1965 infill masonry panels damaged. A few post-1980 brick veneers damaged. Decayed timber piles of houses damaged. Houses not secured to foundations may move. Most unreinforced domestic chimneys damaged, some below roof-line, many brought down. Environment : Cracks appear on steep slopes and in wet ground. Small to moderate slides in roadside cuttings and unsupported excavations. Small water and sand ejections and localized lateral spreading adjacent to streams, canals, lakes, etc.
    MMI IX (Violent shaking) ?
    Structures Many low standard buildings destroyed. Ordinary workmanship buildings heavily damaged, some collapse. Reinforced masonry or concrete buildings damaged, some with partial collapse. Buildings and bridges designed and built to resist earthquakes damaged in some cases, some with flexible frames seriously damaged. Damage or permanent distortion to some buildings and bridges, designed and built to normal use standards. Houses not secured to foundations shifted off. Brick veneers fall and expose frames. Environment : Cracking of ground conspicuous. Landsliding general on steep slopes. Liquefaction effects intensified and more widespread, with large lateral spreading and flow sliding adjacent to streams, canals, lakes, etc.
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