(Major) Earthquakes list July 21, 2012 – 2 moderate earthquakes along the Northern California coast

Last update: July 22, 2012 at 7:48 am by By

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2 moderate earthquakes along the Northern California coast
While looking into the details about these earthquakes, we found a number of coincidences which may be realated to each other. The series started with a M4.0 earthquake at a depth of 10.1 km (6.3 miles) along the Blanco fracture zone in front of the Oregon coast. Nothing special as the stress in the part of the fault is generating regular earthquakes up to M6.0.
1 hour and 18 minutes later a more powerful M5.1 earthquake occurred along the Gorda ridge fault (separating plates), but this time more to the south in the Californian sector. The depth was set to 10 km or 6.2 miles but this is the usual depth which is set if the data are not accurate enough.
Finally (at least up to now) a M5.2 earthquake  occurred at a depth of 0.6 km approx. in the same sector than the earlier M5.1 earthquake. The depth of the last M5.2 earthquake (even poorly constrained) is attracting our attention.  We do not sea anything special on the sea floor except some stress scars and ridges (red lines on the three maps below).
There is certainly no proved relation in between the Oregon and California events, but if ER detects patterns, we like to share them with our readers. The separating plates (spreading center) have been related in the past to a number of volcanic ridge eruptions (like they often are occurring in the spreading ridges of the Oceans). Evidence of such an eruption may be noticed by a coloring of the surface waters. Satellite imagery will probably give us a clue later today.
Only few people at the Eureka coast have reported the shaking at USGS. All of them reported a weak to very weak shaking.

Strong earthquake along the New Zealand North Island coast
One of the many earthquakes who occur the last couple of months along the subduction fault in the Pacific Ocean. The origin of the earthquakes may be more complex than just a subduction fault earthquake as also a transform fault area has been documented in the vicinity of todays epicenter. Far enough from the island to be harmless.

Label info : M = magnitude, D = depth (km), Time = UTC – Click here for the Time Zone world map.
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SRC Location UTC Date/time M D INFO
EMSC Fiji Region Jul 21 23:31 4.7 607 MAP I Felt It
USGS Fiji Region Jul 21 23:31 4.7 599 MAP I Felt It
GEOFON Tonga Islands Jul 21 20:47 4.8 10 MAP I Felt It
EMSC Tonga Jul 21 20:47 4.9 2 MAP I Felt It
USGS Tonga Jul 21 20:47 4.9 10 MAP I Felt It
EMSC Flores Region, Indonesia Jul 21 17:49 4.6 19 MAP I Felt It
GEOFON Flores Region, Indonesia Jul 21 17:49 4.6 19 MAP I Felt It
EMSC Carlsberg Ridge Jul 21 16:42 4.7 10 MAP I Felt It
GEOFON Carlsberg Ridge Jul 21 16:42 4.7 10 MAP I Felt It
USGS Flores Region, Indonesia Jul 21 16:01 4.6 33 MAP I Felt It
EMSC Flores Region, Indonesia Jul 21 16:01 4.6 33 MAP I Felt It
GEOFON Flores Region, Indonesia Jul 21 16:01 4.7 15 MAP I Felt It
EMSC Banda Sea Jul 21 12:46 5.3 241 MAP I Felt It
GEOFON Banda Sea Jul 21 12:46 5.2 241 MAP I Felt It
USGS Banda Sea Jul 21 12:46 5.3 240 MAP I Felt It
EMSC Kuril Islands Jul 21 07:20 4.7 30 MAP I Felt It
GEOFON Kuril Islands Jul 21 07:20 5.0 10 MAP I Felt It
USGS Kuril Islands Jul 21 07:20 4.7 30 MAP I Felt It
EMSC Mariana Islands Region Jul 21 06:37 4.7 2 MAP I Felt It
USGS Mariana Islands Region Jul 21 06:37 4.7 35 MAP I Felt It
GEOFON Mariana Islands Region Jul 21 06:37 4.7 10 MAP I Felt It
EMSC Vanuatu Region Jul 21 06:12 5.9 40 MAP I Felt It
GEOFON Vanuatu Islands Region Jul 21 06:12 5.8 10 MAP I Felt It
USGS Vanuatu Region Jul 21 06:12 5.8 10 MAP I Felt It
GEOFON Near Coast Of N. California Jul 21 06:04 4.8 10 MAP I Felt It
EMSC Offshore Northern California Jul 21 06:04 5.3 2 MAP I Felt It
USGS Offshore Northern California Jul 21 06:04 5.2 0 MAP I Felt It
GEOFON Near Coast Of Chiapas, Mexico Jul 21 06:00 4.8 10 MAP I Felt It
USGS Near The East Coast Of Honshu, Japan Jul 21 03:01 4.9 55 MAP I Felt It
EMSC Near East Coast Of Honshu, Japan Jul 21 03:01 4.9 52 MAP I Felt It
GEOFON Off East Coast Of Honshu, Japan Jul 21 03:01 5.2 41 MAP I Felt It
GEOFON Southeast Of Honshu, Japan Jul 21 02:58 4.8 10 MAP I Felt It
USGS Izu Islands, Japan Region Jul 21 02:58 4.9 19 MAP I Felt It
EMSC Izu Islands, Japan Region Jul 21 02:58 4.9 2 MAP I Felt It
GEOFON Off Coast Of N. California Jul 21 01:52 4.8 10 MAP I Felt It
EMSC Offshore Northern California Jul 21 01:52 5.1 2 MAP I Felt It
USGS Offshore Northern California Jul 21 01:51 5.1 10 MAP I Felt It

Data sources courtesy : USGSEMSCGFZGEONET

Earthquakes occurred yesterday (UTC time), but today local time

Kepulauan Sangihe, Indonesia Jul 20 20:24 PM M 5.1 Depth 90.6 km

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I have felt it Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo he sentido – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه

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Country where you felt the earthquake
City/Village where you felt the earthquake
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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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