Worldwide Volcano earthquakes and Volcano earthquake notifications – Mariana Islands

Last update: July 8, 2012 at 9:59 am by By

Mariana Islands - Farallon de Pajaros Volcano – latest activity : 1992 / latest eruption : 1967
The small 2-km-wide island of Farallon de Pajaros (also known as Uracas) is the northernmost and most active volcano of the Mariana Islands. Its relatively frequent historical eruptions dating back to the mid-19th century have caused the andesitic volcano to be referred to as the “Lighthouse of the western Pacific.” The symmetrical, sparsely vegetated summit is the central cone within a small caldera cutting an older edifice, remnants of which are seen on the SE and southern sides near the coast. Flank fissures have fed lava flows during historical time that form platforms along the coast. Both summit and flank vents have been active at Farallon de Pajaros during historical time. Eruptions have also been observed from nearby submarine vents, and Makhahnas seamount, which rises to within 640 m of the sea surface, lies about 10 km to the SW.
(some text & images : Smithsonian Institution)

SRC Location UTC Date/time M D INFO
GEOFON Mariana Islands Apr 08 06:05 4.9 157 MAP I Felt It INFO
USGS Maug Islands Region, Northern Mariana Islands Apr 08 06:05 4.9 156 MAP I Felt It
ER Farallon, Mariana Islands (startup Record) Jan 01 00:00 0.1 0 MAP I Felt It


Mariana Islands - Agrigan Volcano – latest activity : 1990 / latest eruption : 1917
The highest of the Marianas arc volcanoes, Agrigan contains a 500-m-deep, flat-floored caldera. The elliptical island is 8 km long; its 965-m-high summit is the top of a massive 4000-m-high submarine volcano, the second largest in the Marianas Islands. Deep radial valley dissect the flanks of the thickly vegetated stratovolcano. The elongated caldera is 1 x 2 km wide and is breached to the NW, from where a prominent lava flow extends to the coast and forms a lava delta. The caldera floor is surfaced by fresh-looking lava flows and also contains two cones that may have formed during the volcano’s only historical eruption in 1917. This eruption deposited large blocks and 3 m of ash and lapilli on a village on the SE coast, prompting its evacuation.
(some text & images : Smithsonian Institution)

SRC Location UTC Date/time M D INFO
USGS Agrihan, Northern Mariana Islands May 26 15:01 4.6 209 MAP I Felt It INFO
GEOFON Mariana Islands May 26 15:01 4.7 206 MAP I Felt It INFO
EMSC Pagan Reg., N. Mariana Islands May 26 15:01 4.6 200 MAP I Felt It
USGS Agrihan, Northern Mariana Islands Feb 02 17:59 4.6 221 MAP I Felt It
GEOFON Mariana Islands Feb 02 17:59 4.6 216 MAP I Felt It
USGS Agrihan, Northern Mariana Islands Jan 10 14:54 4.6 230 MAP I Felt It
GEOFON Mariana Islands Jan 10 14:54 4.7 215 MAP I Felt It INFO
EMSC Pagan Reg., N. Mariana Islands Jan 10 14:54 4.8 33 MAP I Felt It
USGS Agrihan, Northern Mariana Islands Dec 06 18:28 4.7 203 MAP I Felt It
GEOFON Mariana Islands Oct 30 19:56 4.7 242 MAP I Felt It INFO
EMSC Pagan Reg., N. Mariana Islands Oct 30 19:56 4.7 242 MAP I Felt It
GEOFON Mariana Islands Oct 21 11:29 4.8 252 MAP I Felt It
GEOFON Mariana Islands Aug 09 09:50 4.8 146 MAP I Felt It
USGS Pagan Region, Northern Mariana Islands Jul 01 15:25 4.7 207 MAP I Felt It INFO
EMSC Pagan Reg., N. Mariana Islands Jul 01 15:25 4.6 205 MAP I Felt It INFO
EMSC Pagan Reg., N. Mariana Islands Jun 10 13:32 5.0 170 MAP I Felt It
USGS Pagan Region, Northern Mariana Islands Jun 10 13:32 5.0 176 MAP I Felt It
GEOFON Mariana Islands Jun 06 07:55 4.6 218 MAP I Felt It
GEOFON Mariana Islands Mar 09 12:46 4.6 230 MAP I Felt It
GEOFON Mariana Islands Feb 01 15:57 5.2 260 MAP I Felt It


Mariana Islands - Pagan Volcano – latest activity : 2011 / latest eruption : 2006
Pagan Island, the largest and one of the most active of the Mariana Islands volcanoes, consists of two stratovolcanoes connected by a narrow isthmus. Both North and South Pagan stratovolcanoes were constructed within calderas, 7 and 4 km in diameter, respectively. The 570-m-high Mount Pagan at the NE end of the island rises above the flat floor of the northern caldera, which may have formed less than 1000 years ago. South Pagan is a 548-m-high stratovolcano with an elongated summit containing four distinct craters. Almost all of the historical eruptions of Pagan, which date back to the 17th century, have originated from North Pagan volcano. The largest eruption of Pagan during historical time took place in 1981 and prompted the evacuation of the sparsely populated island.
(some text & images : Smithsonian Institution)

SRC Location UTC Date/time M D INFO
GEOFON Mariana Islands Dec 06 18:28 4.8 207 MAP I Felt It
GEOFON Mariana Islands Sep 20 23:02 4.3 352 MAP I Felt It INFO
ER Pagan, Mariana Islands (stratup Record) Jan 01 00:00 0.1 0 MAP I Felt It
James Daniell CATDAT Guam, Northern Mariana Islands Sep 22 08:00 8.1 60 MAP I Felt It


Mariana Islands - Sarigan Volcano – latest eruption : 2010
Sarigan volcano forms a 3-km-long, roughly triangular island. A low truncated cone with a 750-m-wide summit crater contains a small ash cone. The youngest eruptions produced two lava domes from vents above and near the south crater rim. Lava flows from each dome reached the coast and extended out to sea, forming irregular shorelines. The northern flow overtopped the crater rim on the north and NW sides. The sparse vegetation on the flows indicates they are of Holocene age (Meijer and Reagan, 1981).
(some text & images : Smithsonian Institution)

SRC Location UTC Date/time M D INFO
ER Sarigan, Mariana Islands (startup Record) Jan 01 00:00 0.1 0 MAP I Felt It


Mariana Islands - Anatahan Volcano – latest eruption : 2008
The elongate, 9-km-long island of Anatahan in the central Mariana Islands consists of a large stratovolcano with a 2.3 x 5 km, E-W-trending compound summit caldera. The larger western portion of the caldera is 2.3 x 3 km wide, and its western rim forms the island’s 790-m high point. Ponded lava flows overlain by pyroclastic deposits fill the floor of the western caldera, whose SW side is cut by a fresh-looking smaller crater. The 2-km-wide eastern portion of the caldera contained a steep-walled inner crater whose floor prior to the 2003 eruption was only 68 m above sea level. A submarine volcano, named NE Anatahan, rises to within 460 m of the sea surface on the NE flank of the volcano, and numerous other submarine vents are found on the NE-to-SE flanks. Sparseness of vegetation on the most recent lava flows on Anatahan had indicated that they were of Holocene age, but the first historical eruption of Anatahan did not occur until May 2003, when a large explosive eruption took place forming a new crater inside the eastern caldera.
(some text & images : Smithsonian Institution)

SRC Location UTC Date/time M D INFO
USGS Anatahan, Northern Mariana Islands Apr 15 23:08 4.5 531 MAP I Felt It INFO
EMSC Anatahan Reg, N. Mariana Islands Apr 15 23:08 4.6 535 MAP I Felt It
GEOFON Mariana Islands Apr 15 23:08 4.6 540 MAP I Felt It INFO
USGS Anatahan, Northern Mariana Islands Dec 15 06:45 4.4 521 MAP I Felt It INFO
GEOFON Mariana Islands Dec 15 06:45 4.3 525 MAP I Felt It INFO
EMSC Anatahan Reg, N. Mariana Islands Dec 15 06:45 4.4 522 MAP I Felt It INFO
ER Anatahan, Mariana Islands (startup Record) Jan 01 00:00 0.1 0 MAP I Felt It


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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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