Moderate earthquake in the San Francisco Bay Area, California - December 27, 2017

Update : Focal mechanism of this earthquake.
Do beach balls looks like Chinese or Latin to you, check this article "Understanding Beach Balls"

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Update : Based on the present earthquake parameters (Magnitude, Depth, Population, etc) and our experience with earthquake damage impact, does not expect any serious damage from this earthquake

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Alum Rock, California, 8.0 km (5.0 mi)
Milpitas, California, 15.0 km (9.3 mi)
San Jose, California, 15.0 km (9.3 mi)
Santa Clara, California, 20.0 km (12.4 mi)
Sunnyvale, California, 25.0 km (15.5 mi)

Most important Earthquake Data:

Magnitude : 3.9

Local Time (conversion only below land) : 2017-12-26 22:32:09

GMT/UTC Time : 2017-12-27 06:32:09

Depth (Hypocenter) : 11 km

Depth and Magnitude updates in the list below.

Donation - long - San Francisco

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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
USGS Tres Pinos, Ca Dec 27 23:48 2.5 3 MAP
  • San Leandro - Moderate shaking
  • Santa Clara - we are on the 8th story of a hotel. shaking lasted maybe 30 seconds and made the upper floor have residual sway after. I have been in high buildings before after stronger earth quakes, this one felt pretty mild.
  • Mariposa - Dogs lifted their heads up and looked around and house "popped/cracked". I immediately looked at eq sites but nothing showed up except a report on FB from a woman in Morgan Hill. Found this report this morning.
  • San Francisco - Strong shaking
  • Fremont - Swishing wind like sound. Sway feeling for about 3 seconds.
  • Pacifica - At least 5 seconds, no damage
  • Saratoga, CA - It woke me up from a deep sleep. It felt like a a large size dog knocked into my bed and woke me up. The December 26 or 27 earthquake felt like a person knocked the bed or ran into it.
  • USGS Alum Rock, Ca Dec 27 06:32 3.9 10 MAP
  • Fremont, CA - Weak shaking
  • Santa Cruz - Light shaking
  • Los Gatos - 2 seconds none...could have been something else.
  • FREMONT - Just a single jolt
  • San jose - About 3 seconds
  • Colma - Very weak shaking
  • Sam Jose - Must have lasted all of 2 seconds. Pretty abrupt shaking, though. We are in San Jose, CA
  • Soquel/Santa Cruz - Just a few seconds but enough to notice
  • Morgan hill - Light shaking
  • Sunnyvale - Weak shaking
  • Cupertino - Two story house, felt the house jolt for one second. No damage
  • Fremont - Lasted about 3 seconds. Felt like strong wind was shaking the house, or large truck was going by. People in other back part of house did not feel. Neighbors reported shaking by also.
  • santa cruz ca - no damage, very short, light rattling of windows and shutters
  • Milpitas - No property damage felt like a huge truck zoomed by and I was living in a plastic house. Shaking lasted 3 to 5 seconds.
  • Santa Clara - Sounded loud enough to wake up the cat, very brief rattling of the house, perhaps three seconds, just enough time to recognize it was my first perceived earthquake since moving to California!
  • Fremont - Sitting in bed and bookshelf shook, no warning or response from pets. No damage.
  • Oakland - Weak shaking
  • Bandar Kinrara, Puchong - It happened two times, the first about 2-3 seconds and the second about 4-5.I know this is kinda overreacting, but we don\'t really get earthquakes in Malaysia, so might also report because we were freaked the hell out.
  • Bandar Kinrara, Puchong - It happened twice. The first time happened for about a couple seconds. The second time, it lasted about 4-5 seconds. It might seem like I was overreacting, but we don\'t really get earthquakes here in Malaysia. Just thought I might report just in case.
  • Milpitas - I felt the shaking and how the bed moved. No Damages
  • Bandar Kinrara, Puchong - The first time lasted a couple seconds, while the second stream lasted about 4-5 seconds. We don\'t really get tremors in Malaysia, so might as well report just in case
  • Daly City - Light shaking
  • Daly City - Light shaking
  • Narita - I felt a light shaking for only about 3 seconds. Also there was a rumbling sound, but that could be unrelated (possible traffic or airplane)
  • tokyo - 3 secondes , walls slowly moved
  • Tehran, Iran - Very weak shaking
  • Milpitas - Shaking enough to wake me up from sleep. It felt like my toddler was rolling around on my bed.
  • MILPITAS - Weak shaking
  • Sunnyvale - Lasted 3-4 seconds, felt like kids running faster in the hallway
  • San Francisco - Moderate shaking
  • San Jose - I live on the East side of San Jose so we directly felt they shaking.
  • SAN FRANCISCO - for 2-3 seconds, the bookshelves shook, like a large truck passing by, but more like a light earthquake tremor
  • Fremont - For 2 to 3 seconds I felt like I went back and came back , My bed room doors were shaking badly all of a sudden..By God's grace it came back to normal..
  • Hayward - consistent for about 5 seconds, no mistaking
  • EMSC San Francisco Bay Area, Calif. Dec 27 06:32 3.9 11 MAP I Felt It INFO
    USGS San Martin, Ca Dec 27 03:19 3.1 7 MAP I Felt It INFO




    Other earthquakes in the greater epicenter area

    Strongest earthquakes (since 1900) within a 150 km radius from this earthquake

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    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.
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