Very strong earthquake below Costa Rica - August 17, 2018

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Update : A lot of reports from fallen objects but so far no signs of serious damage, injuries or fatalities

Update : Shaking map based on the findings of the Universidad the Costa Rica

Update : Main earth movement based on the current focal mechanism is a thrust .
People who experienced the shaking can easily determine which of both fault planes is the right one.
Either fault plane 1 or fault plane 2 is possible in this case.
Images courtesy Observatoire Geoscope

Update : Shaking impact on nearby cities and villages and on the population in MMI (Modified Mercalli scaled).

Update : Shaking map as reported by the USGS. Maximum moderate shaking in populated areas.

Update : Based on the present earthquake parameters (Magnitude, Depth, Population, etc) and our experience with earthquake damage impact, does expect at least some slight damage like cracks in walls, fallen tiles, etc.

Most important Earthquake Data:

Magnitude : 6.1

Local Time (conversion only below land) : 2018-08-17 17:22:23

GMT/UTC Time : 2018-08-17 23:22:23

Depth (Hypocenter) : 10 km

Depth and Magnitude updates in the list below.

Share your earthquake experience (I Have Felt It) with our readers.
Click on the "I Felt It" button behind the corresponding earthquake. Your earthquake experience is not only important for science, but also for people in the area as well as our global readership.

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SRC Location UTC Date/time M D INFO
EMSC Costa Rica Aug 17 23:55 4.0 20 MAP I Felt It INFO
  • Manuel Antonio - J'étais dans la mer, les vagues sont devenues gigantesques. Je suis revenue à la terre ferme et je me suis allongée sur le sable. C'est alors que pendant 10 secondes j'ai senti que le sol bougeait, je me déplaçais toute seule.
  • USGS San Vito, Costa Rica Aug 17 23:49 4.6 17 MAP
    EMSC Costa Rica Aug 17 23:49 4.6 33 MAP
    GEOFON Costa Rica Aug 17 23:49 4.7 10 MAP I Felt It INFO
    USGS Golfito, Costa Rica Aug 17 23:22 6.1 15 MAP
    GEOFON Costa Rica Aug 17 23:22 6.1 10 MAP I Felt It INFO
  • Boquete - Happened at 6:26pm Panama time, felt like a light roller, lasted for about 20 seconds. Nothing fell or broke. Location Hacienda Los Molinos, about 6 miles south of Boquete/Chririqui
  • Escazú - Almost 50 seconds at 5:24 pm
  • Boquete - Moderate shaking
  • Quepos - 2 secousses d\'une durée de 5 secondes en tout
  • San Isidro de General - about 10 seconds of shaking
  • Sarchi - Doors and windows were creaking. Large cactus outside was swaying. Lasted about 50 seconds.
  • Heredia - Lo siento bastante fuerte para ser sincera, I felt it very strong to be honest
  • Monteverde - Shaking for 40-50 seconds, felt like weakness in your knees
  • 83.20°W 8.66°N - F-E Region: Costa Rica Time: 2018-08-17 23:22:23.7 UTC Magnitude: 6.1 Epicenter: 83.20°W 8.66°N Geohack coords Depth: 10 km Status: A - automatic
  • Localisation actuelle - 30 secondes
  • Alajuela - à 17.30 heure locale (précise, je suis suisse donc la précision celà me connait), la maisonnette ou je réside s'est mis a bouger pendant 10-20 seconde ..maxi..sans dégât ni coupure d'électricité ou de net !
  • Viscaya - A swaying motion that lasted about 10 seconds. No damage.
  • Bahia Drake - Buildings shaked for 10/15 secondes. Power is down.
  • San Isidro El General - Clearly identifiable shaking that lasted about 10 seconds
  • Boqueron - About 5 to 10 seconds of swaying, circular motion
  • Boquete - Light shaking
  • Localisation actuelle - 2eme secousse en 30 min, il a duré 5 secondes
  • Quepos - The table I was sitting at was waving. I thought my husband was moving it but it wasn’t him.
  • David - Hi guys, This is the first time I am beating you in a report!Was strong, do not know if tsunami warning is in place! M 6.0 - 15km N of Golfito, Costa Rica 2018-08-17 23:22:25 UTC 8.772°N 83.139°W 19.1 km depth
  • Manuel Antonio - Sitting on a hotel room balcony. Light shaking for 5 seconds. One small aftershock about 5 mins later. No damage.
  • Piedras Blancas National Park - We were at the epicenter 😨- ER: WOW!
  • EMSC Off Coast Of Costa Rica Aug 17 12:19 3.4 3 MAP I Felt It INFO
    EMSC Off Coast Of Costa Rica Aug 17 12:16 3.7 15 MAP I Felt It INFO

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    Screen Shot 2018-02-12 at 18.31.30

    I felt the shaking *
    Country where you felt the earthquake *
    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
    Shaking Strength *
    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.
    Tell us your experience and how many seconds the shaking lasted + let us know if your property has been damaged (even slight damage). (max. 500 characters)
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