Posts
17
December, 2012
Mount
Lokon in Tomohon, North Sulawesi, erupted at around 12 p.m. local
time on Monday following escalating volcanic activity.
"Ashes
from the eruption rose to 3,000 meters. Local residents have been
asked to take precautions," the chief of the Lokon and Mahawu
monitoring station, Farid Ruskanda Bima, in Tomohon on Monday, as
quoted by Antara news agency.
Mount
Lokon has shown an increase in volcanic activity since early
December. The Lokon and Mahawu monitoring station recorded eruptions
on Dec. 3, Dec. 5 and Dec. 8, spouting volcanic dust up to 3,500
meters into the sky.
The
volcano had also erupted several times in October and September.
NZ:
VOLCANIC ALERT BULLETIN: WHITE ISLAND VOLCANO
Volcanic
Alert Level: 2 (increased from 1)
Aviation Colour Code: Orange (increased from Yellow)
Aviation Colour Code: Orange (increased from Yellow)
1.30
pm Wednesday 12 December
2012
Spiny
Lava Dome – A New and Unusual Style of Eruptive Activity At White
Island GNS Science volcanologists have noticed a spiny lava dome at
White Island in an existing small crater formed as a result of
eruptions in August. The Volcanic Alert Level has been raised to 2
and the Aviation Colour Code to Orange.
“On
Monday we were able to see a spiny lava dome that has grown in a
crater formed by an eruption on August 5. We were really lucky the
steam was not too thick and got great views. The dome is probably 20
– 30 metres across and has spines sticking up. In more than 30
years visiting White Island I've never seen anything like it”, said
GNS Science volcanologist Brad Scott.
“If
you imagine a volcano is like a tube of toothpaste then a lava dome
is like the congealed, dried toothpaste that has come out of the
tube. It doesn't movelike a lava flow but grows from the inside as
new magma comes up and pushes the already cooled magma upwards and
outwards” said Mr Scott.
A
close up view of the dome. The dome is made of thick, relatively cool
and congealed lava and has prominent spines. The dome is about 20 –
30 metres across. In the foreground is a small, cold lake.Photo by
Brad Scott.
Comments
from tour operators at White Island suggest the dome may have been
visible for two weeks, but not as clearly as Monday. How long the
dome has been growing is unknown, but possibly since the ash eruption
in early August.
Lava
domes are usually formed by magma that has lost most of its gases so
that it is very sticky. This causes the magma to pile up over the
volcanic event and form a dome. Lava domes are common at some
volcanoes, but have never been seen before at White Island.
Magma
last reached the surface at White Island in 2000. At that time it was
erupted explosively as molten rocks called volcanic bombs, rather
than forming a dome.
“We've
raised the Volcanic Alert Level and Aviation Colour Code to reflect
the new style of eruptive activity”, said GNS Science head
volcanologist Gill Jolly.
“Our
concern is that lava dome growth can be accompanied by explosive
eruptions and could impact people on the island. We need to see if
the dome is continuing to grow. If it's not growing then we will be
less concerned”.
GNS
Science continues to closely monitor White Island through the GeoNet
project.
(Major) Earthquakes list December 18, 2012
Last
update: December 18, 2012 at 6:55 pm by By Ashish
Khanal
-
SRC
|
Location
|
UTC Date/time
|
M
|
D
|
INFORMATION
|
|
ER
|
I Felt A (not Listed) Strong Earthquake
|
Dec 18 23:59 PM
|
4.6
|
0.1
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||
EMSC
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Near East Coast Of Honshu, Japan
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Dec 18 18:36 PM
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5.0
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10.0
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||
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||||||
USGS
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Near The East Coast Of Honshu, Japan
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Dec 18 18:36 PM
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5.0
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25.7
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||
GEOFON
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Near East Coast Of Honshu, Japan
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Dec 18 18:36 PM
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5.1
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10.0
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||
EMSC
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Sulawesi, Indonesia
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Dec 18 16:39 PM
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4.6
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10.0
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||
GEOFON
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Sulawesi, Indonesia
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Dec 18 16:39 PM
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4.7
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10.0
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||
EMSC
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Myanmar
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Dec 18 11:51 AM
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4.8
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30.0
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||
USGS
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Myanmar
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Dec 18 11:51 AM
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4.6
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39.6
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||
GEOFON
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Myanmar
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Dec 18 11:51 AM
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4.8
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12.0
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||
EMSC
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South Of Java, Indonesia
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Dec 18 10:49 AM
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4.8
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4.0
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||
GEOFON
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South Of Java, Indonesia
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Dec 18 10:49 AM
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4.8
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23.0
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||
USGS
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Eastern Honshu, Japan
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Dec 18 10:26 AM
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4.6
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77.2
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EMSC
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Near East Coast Of Honshu, Japan
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Dec 18 10:25 AM
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4.8
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55.0
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GEOFON
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Near East Coast Of Honshu, Japan
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Dec 18 10:25 AM
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4.9
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40.0
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GEOFON
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Flores Sea
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Dec 18 08:27 AM
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4.8
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27.0
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||
USGS
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Flores Sea
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Dec 18 08:27 AM
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4.7
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40.1
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||
EMSC
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Flores Sea
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Dec 18 08:27 AM
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4.8
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50.0
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EMSC
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Offshore El Salvador
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Dec 18 08:12 AM
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5.0
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70.0
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GEOFON
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El Salvador
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Dec 18 08:12 AM
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5.0
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63.0
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USGS
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Offshore El Salvador
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Dec 18 08:12 AM
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5.1
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57.5
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USGS
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Oaxaca, Mexico
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Dec 18 01:38 AM
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4.8
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60.9
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||
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||||||
EMSC
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Oaxaca, Mexico
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Dec 18 01:38 AM
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4.7
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60.0
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GEOFON
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Oaxaca, Mexico
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Dec 18 01:38 AM
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4.9
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84.0
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EMSC
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Myanmar
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Dec 18 01:32 AM
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4.6
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41.0
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USGS
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Myanmar
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Dec 18 01:32 AM
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4.6
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41.0
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||
Earthquakes
occurred yesterday (UTC time), but today local time
Off The East Coast Of Honshu, Japan
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Dec 17 22:52 PM
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M 5.0
|
Depth 47.3 km
|
More
than 20 flood warnings issued as weather looks set to turn from bad
to worse
18
December, 2012
Forecasters
have warned people to expect up to 70 days of unsettled conditions as
a series of wet weather systems engulf the UK.
And
pockets of England have been told to prepare for yet further flooding
after the Environment Agency issued another round of warnings.
Parts
of England and Wales were brought to their knees last month when
flood water surged through streets and down roads, cutting off whole
communities and forcing dozens to flee their homes.
Rivers
burst their banks and fields were flooded as several days' rain fell
in just a few hours.
Sections
of the transport network also ground to a halt as train travel was
disrupted and some small passenger planes grounded.
The
UK has experienced pockets of mild, dry weather in the run-up to
Christmas, but that is all expected to change by tomorrow.
John
Lee, a forecaster with MeteoGroup - the weather division of the Press
Association - said: "It is going to be quite unsettled, wet and
windy across the UK for the next few days.
"We're
looking at 70 days ahead and in that time it is looking unsettled
with a succession of Atlantic systems coming to the UK.
"Does
that mean 70 days of rain? No, but it is going to be mild and
unsettled until Christmas."
Mr
Lee said the east coast of England could expect gusty winds too,
before the weather system starts clearing from Cornwall and Devon on
Friday.
However,
he said this would likely be replaced by yet another band of wet
weather.
"It
is not uncommon for this time of year, so I think people should
expect a few showers."
It
comes as the Environment Agency placed five areas under flood
warnings - the second most serious of three types of weather
warnings, meaning some flooding is expected.
There
are three such warnings in place in the South West - including the
Somerset Levels - and two for the Anglian region. More than 20 flood
alerts have also been issued this evening, across the UK, meaning
residents should be prepared for the risk of flooding.
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