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DATA
FROM DR. KERRY SIEH
QUAKE
DATA AND ISLAND MOVEMENT:
- The
break in the Nias plate on March 28, 2005 was 300 km
long.
- The
Nias break resulted in the 8.7 earthquake of March 28,
2005.
- As
a result of the plate shift on March 28th, both Nias
and Simeulue islands tilted east towards the mainland
of Sumatra. The largest uplift was at Lahewa –
the northwest tip of Nias – it rose 2.9 meters.
- Sirombu,
a village about ½ way up the west coast of Nias,
and the area where the most deaths were recorded after
the December 26th earthquake, has lifted 2.4 meters.
- The
Hinako Islands, just off the southwest side of Nias
Island rose 1 meter. Lagundri, the southwest tip of
Nias Island, is only up 70 cm.
- Teluk
Dalam, the southernmost village, and major southern
port on Nias, is down a few centimeters.
- Nyang
Nyang Island, just south of Siberut Island, about 100
miles west of Padang, moved 10 cm towards Sumatra.
- The
west side of Nias and the west side of Simeulue Island
had the max uplift.
- Aloban,
the second biggest town in the Banyak Island chain is
down 30cm.
- Pulau
Balai, the largest town in the Banyak Islands, is down
80 cm. At high tide the road along the harbor at Pulau
Balai is 80 cm under water.
THE
DIFFERENCE BETWEEN THE TWO QUAKES:
- Aceh
December 26… 9.3 earthquake (this has been recently
adjusted from the original 9.0) – 1600 meters
of breakage, resulting in a 10-meter tsunami.
- Nias
March 28 … 8.7 earthquake – 300 meters of
breakage. The Nias earthquake had approx 5 times less
energy, and approx 10 times less water movement, yet
much more geographical changes to the islands. The biggest
tsunami effect recorded was roughly 2 meters on SW side
of Nias.
MORE
INSIGHTS FROM KERRY
- Kerry
said he is less worried about a giant earthquake happening
anywhere the plates have popped up. He said Padang is
rising slightly, which means in an event of a big earthquake
it will likely sink.
- Most
of Padang is below 5 meters above sea level. The tsunami
that hit Aceh was 10 meters. In the March 28th earthquake,
a tsunami came in 2 meters on the southwest area of
Nias.
- The
hinge of the two plates is between Lagundri, southwest
tip of Nias Island, and Teluk Dalam, 15 – 20 km
east of Lagundri. This means that in that 15 –
20 km of land, the earth hinged and one side rose while
the other side dropped.
- Onolimbu
and Bodsijhona, villages on the eastern tip of Nias,
have dropped. These villages are located 10 –
20 miles SE of the airport at Gunung Sitoli –
Nias’ largest town. They are on a river delta,
which has accentuated the sinking. The coastline there
is mainly coconut groves, which are continuing to fall
into the sea.
- The
Island of Bojo, the southernmost island of the Telo/Batu
Island chain, is locked tight. Meaning the plates are
not releasing any pressure. But there is nothing new
to suggest another big earthquake – nothing geologic
to issue a warning.
- New
evidence has been found that the earthquake/tsunami
of 1797 centered in the Mentawai Islands broke through
from the southern islands of Pagai to the northern island
of Siberut. Siberut received the least amount of rising
at 70cm. This caused an English ship to be pushed 1
km inland by the tsunami in the Maura area of Padang.
This information comes from translations of Dutch documents
recorded after the 1797 earthquake.
- The
earthquake/tsunami of 1833 went from Enganno to Tuapajet.
Kerry says that if the next tsunami is similar to the
one of 1833, then we are to expect a 4 – 5 meter
tsunami along the east coast of Padang. Most of Padang
is 4 - 5 meters above sea level. A 5-meter tsunami would
cover most of the city.
- Siberut
Island (the northernmost island in the Mentawais) is
the most likely next spot for a BIG quake; it has sunk
the furthest of Sumatra’s outer islands and at
present has the most pressure being put on it.
- The
subduction zone is curved, and vertical. The Indian
Ocean/Aussie plate is moving north. This plate is breaking
along that curve from the outside in stretching the
length of the outer islands off the west coast of Sumatra.
- The
Mentawai break, thought to happen near Siberut, and
the one that would hit Padang, would likely be more
similar to the Nias break than the Aceh break. The length
of the area shifted during the Aceh quake was the longest
in recorded history.
- Japanese
bunkers from World War 2 that have been underwater for
years located in the southeast area of Simeulue, have
now been pushed back up and are completely above the
water.
- The
April 10th earthquake caused a small tsunami. Padang
recorded 20 cm river movement.
- There
have been 10 mega quakes in the last 100 years before
the Aceh quake. A mega quake registers at least 9.0
on the Richter scale. The years 1950 and 1965 recorded
the most. 70% of these mega quakes happened in 15% of
that 100 years, which means they happen in clusters.
Five of these mega quakes were recorded in the north
pacific / Alaskan area.
- If
a tsunami happened in Padang, the earth would shake
for about 3 minutes. The water in the rivers and along
the coast would begin to recede approx 15 minutes after
the quake. Approx ½ hour after the water began
to recede, it would come back as a tsunami at least
5 meters high. This would give people less than an hour
to evacuate and move to higher ground.
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