Very strong dangerous aftershock below Ixtepec, Oaxaca - 4 people killed - September 23, 2017

Created September 23, 2017 Last update September 26, 2017 17:34 By

Damage report in cooperation with the 2017 Earthquake Impact Database - EID on Google Docs
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Update September 2617:04 UTC: An update about fallout of this violent aftershock

Fatalities : 4
Injured people : 7
Damaged buildings : 7
Destroyed buildings : 12

 

Update 20:53 UTC: 2 woman have been killed during this earthquake although not by the shaking but by heart attacks. 7 others were injured.
9 residential houses/buildings have collapsed.

Screen Shot 2017-09-23 at 22.52.42

Update 14:27 UTC: same bridge (see also picture below) before and after this aftershock!

Screen Shot 2017-09-23 at 16.27.19

Update 14:24 UTC: Main earth movement based on the current focal mechanism. Image courtesy Observatoire Geoscope

Screen Shot 2017-09-23 at 16.25.14

Update 14:24 UTC:

Screen Shot 2017-09-23 at 16.23.34

Update 14:16 UTC: An already damaged bridge collapsed during this aftershock 🙁

Update 13:59 UTC: The focal mechanism shows and extensional normal earthquake type
Do beach balls looks like Chinese or Latin to you, check this article "Understanding Beach Balls"

Screen Shot 2017-09-23 at 15.59.01-compressed

main movement FM

Important update 13:55 UTC: USGS has updated the depth of the hypocenter which comes now at 9 km instead of +30 km, a whole world of difference if you compare the shaking intensity and which explains the picture of a collapsed house we just published!

Screen Shot 2017-09-23 at 15.54.10-compressed

Screen Shot 2017-09-23 at 15.54.21-compressed

Screen Shot 2017-09-23 at 15.54.48

Update 13:46 UTC: First pictures of damage are coming in from Ixtepec

Update 13:39 UTC: Live in Mexico these days - A reader wrote us a few moments ago "enough is enough" and we fully understand him

Screen Shot 2017-09-23 at 15.38.47

Update 13:33 UTC: people and animals are in Oaxaca again in the middle of the street (the best place to stay if traffic stopped)

Screen Shot 2017-09-23 at 15.32.30

Update 13:27 UTC: Professor Max Wyss, who specializes in theoretical prognoses of injuries and fatalities expects : 0 to 10 fatalities and 10 until 100 injured people

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Update 13:21 UTC:

Screen Shot 2017-09-23 at 15.21.07-compressed

Screen Shot 2017-09-23 at 15.21.23-compressed

Update 13:19 UTC: Another shaking map with colors and MMI intensities Max expected intensity MMI V (moderate shaking)

Screen Shot 2017-09-23 at 15.18.36

Update 13:18 UTC: shaking map of Mexico

Screen Shot 2017-09-23 at 15.17.04

Update 13:08 UTC: Nearest city : Lagunas

Update 13:07 UTC: Seismogram as recorded in a seismological station in Guatemala

Screen Shot 2017-09-23 at 14.58.42

Update 13:06 UTC: This aftershick is below land instead as below the sea which will increase the shaking intensity a lot. Additional damage is very probable!

Screen Shot 2017-09-23 at 14.59.02

Map courtesy Alomax.free.net - Star: calculated epicenter - Small red dots: possible error margin for the epicenter, the more dense, the higher probability that the epicenter will be in that area. Orange circle: epicenter location error zone

Most important Earthquake Data:

Magnitude : 6.1

Local Time (conversion only below land) : 2017-09-23 07:53:02

GMT/UTC Time : 2017-09-23 12:53:02

Depth (Hypocenter) : 10 km

Depth and Magnitude updates in the list below.

Donation - long - San Francisco

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.

Refresh this list
SRC Location UTC Date/time M D INFO
GEOFON Oaxaca, Mexico Sep 23 23:06 4.4 61 MAP
EMSC Oaxaca, Mexico Sep 23 23:06 4.5 70 MAP I Felt It INFO
USGS San Jeronimo Ixtepec, Mexico Sep 23 23:06 4.5 8 MAP
EMSC Oaxaca, Mexico Sep 23 20:53 4.3 101 MAP I Felt It INFO
EMSC Oaxaca, Mexico Sep 23 20:36 4.6 71 MAP I Felt It INFO
EMSC Oaxaca, Mexico Sep 23 20:01 4.2 27 MAP I Felt It INFO
USGS Niltepec, Mexico Sep 23 16:24 4.4 10 MAP
EMSC Oaxaca, Mexico Sep 23 16:24 4.4 10 MAP I Felt It INFO
EMSC Oaxaca, Mexico Sep 23 16:16 4.6 50 MAP
USGS San Jeronimo Ixtepec, Mexico Sep 23 15:06 4.2 10 MAP
EMSC Oaxaca, Mexico Sep 23 15:06 4.2 10 MAP I Felt It INFO
EMSC Oaxaca, Mexico Sep 23 14:54 4.4 105 MAP I Felt It INFO
  • oaxaca city - There were three, about half hour apart. Each lasted about 30 seconds. I was outside and didn't even feel them. My wife was in the house, however, and she felt them.
    		•
    EMSC Oaxaca, Mexico Sep 23 14:31 4.9 10 MAP
    GEOFON Oaxaca, Mexico Sep 23 14:31 4.9 41 MAP
    USGS Union Hidalgo, Mexico Sep 23 14:31 4.9 10 MAP I Felt It INFO
    USGS Matias Romero, Mexico Sep 23 14:27 4.2 10 MAP
    EMSC Oaxaca, Mexico Sep 23 14:27 4.2 10 MAP
    EMSC Oaxaca, Mexico Sep 23 14:18 4.4 10 MAP I Felt It INFO
    USGS Santa Maria Petapa, Mexico Sep 23 14:18 4.4 10 MAP I Felt It INFO
    EMSC Oaxaca, Mexico Sep 23 14:01 4.8 57 MAP I Felt It INFO
    GEOFON Oaxaca, Mexico Sep 23 13:24 4.8 83 MAP I Felt It INFO
    EMSC Oaxaca, Mexico Sep 23 13:24 4.8 10 MAP I Felt It INFO
    USGS Matias Romero, Mexico Sep 23 13:24 4.8 10 MAP I Felt It INFO
  • Oaxaca City - Very light shaking perceptible in bed. Hanging lights swayed briefly.
    		•
    USGS Matias Romero, Mexico Sep 23 12:53 6.1 9 MAP
  • Mexico city - Light shaking in Mexico city.
  • Mexico - Entendu une sirène, puis les chiens aboyer. Durée de l'agitation, peut-être 10 secondes.
  • Mexico City - Very weak and short lived. Alarms went off and everybody evacuated.
  • Oaxaca city - Moderate shaking
    		•
    GEOFON Oaxaca, Mexico Sep 23 12:53 6.1 10 MAP I Felt It INFO
  • Oaxaca - Long aftershock. Rattled
  • Puerto Escondido - 755 am local time. Quizas 15-20 seconds
  • Santiago Apostol, Ocotlán, Oaxaca - About 10-15 sec
  • Puebla - no damage 25-20 seconds
  • Oaxaca City - Moderate shaking for 10 seconds, nothing fell, no obvious damage
  • Mexico City - Very weak shaking
  • San Cristobal de Las Casas - We felt it - hanging plants swayed slightly, water it pitcher rocked. Alarm went off.
  • Oaxaca - Small cracks on the wall
  • Oaxaca city - Light shaking
  • Oaxaca - Enough! Tired of this.
  • Oaxaca City - Woke us up on 2nd floor. ~20 seconds of swaying. No apparent damage.
    		•
    USGS Paredon, Mexico Sep 23 10:38 5.8 74 MAP
  • Tuxtla Gutiérrez Chiapas México - Movimiento de floreros
    		•
    GEOFON Near Coast Of Oaxaca, Mexico Sep 23 10:38 5.7 63 MAP I Felt It INFO
  • Oaxaca - 5 seconds or less, no damage, nothing fell. I was awake, in bed.
    		•
    USGS Paredon, Mexico Sep 23 07:18 4.1 61 MAP
    EMSC Offshore Oaxaca, Mexico Sep 23 07:18 4.3 36 MAP
    EMSC Offshore Oaxaca, Mexico Sep 23 04:56 4.1 6 MAP I Felt It INFO
  • Tapachula chiapas - 6 segundos de duración se sintió levemente
  • Oaxaca City - Possibly 5 seconds of light shaking around 5:45 central time.
    		•
    USGS San Mateo Del Mar, Mexico Sep 23 03:34 4.2 33 MAP I Felt It INFO

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    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) ?
    People
    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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