Gempa bumi itu ya permukaan buminya berguncang.
Itu gejala biasa sunatulloh, kayak sunatulloh dari manusia yang lahir, sehat, sakit, mati. Gak usah dihubung-hubungkan dengan yang enggak-enggak. easy man.
A_Dharmawan <[EMAIL PROTECTED]> wrote:
Wednesday, 14, September, 2005 (10, Sha`ban, 1426)
Makkah Quake a Minor Event, Says Geologist
Roger Harrison & Essam Al-Ghalib, Arab News
JEDDAH/MAKKAH, 14 September 2005 The earthquake that shook Makkahs
Al-Otaibiyyah neighborhood, about two kilometers from the Grand Mosque, at 2
a.m. on Monday has engendered a sense of shock and vulnerability in the
citizens of Makkah.
There were no casualties and no damage to buildings, although residents
reported dogs barking just before the shocks and a sound of rumbling or what
sounded like an explosion.
The tremors, which are variously reported as occurring for between one and
nine hours after the initial shock, kept tension high in the city.
Suggestions that the tremors were caused by construction work going on in
the city have been discounted.
Twenty-three- year-old Siraj Muhammad Omar, a resident of the Al-Otaibiyyah
neighborhood, was thankful that there was no damage. He said he felt the
earth move four times, with the first and fourth shakes being the strongest.
He and seven other family members were scared after the first jolt and
rushed to the roof of the building.
Muhammad Baid, a 22-year-old Moroccan, said he left the house soon after
feeling the first shake and went back when everything returned to normal.
Seventeen-year-old Aiyman Al-Maihmadi was at the controls of his PlayStation
when he heard a low rumble, followed by a soft knock and then a hard knock.
He said people rushed on to Shara Al-Jazayer, where many people milled
around wondering what had caused the shakes.
Makkah Governor Prince Abdul Majeed has formed a committee to establish the
exact circumstances and details of the event.
Dr. Ian Stewart, geophysical technical adviser to the Saudi Geological
Society (SGS ), said the scale of the shock in Makkah was not worth worrying
about.
The earthquake was monitored in Madinah, 300 km away, at about 3.7 on the
Richter scale.
Anything which is moderately well built shouldnt suffer anything at all.
It would hardly raise an eyebrow in California, he said.
California is an extremely active earthquake zone.
The energy released by an earthquake of magnitude 3-3.5 on the Richter scale
is roughly equivalent to 30-70 tons of TNT exploding. They are often felt
but rarely cause anything other than minimal damage. It is estimated that
50,000 or so take place worldwide each year.
I imagine, and this is before we have analyzed the data, that the quake was
extremely shallow, said Dr. Stewart.
The Red Sea and the edges of the Arabian tectonic plate, which comprises the
whole of Saudi Arabia and the Arabian Peninsula, is an active seismic
region. Earthquakes are the result of seismic wave s that are generated by
sudden movement in masses of rocks, most commonly from slippage along fault
lines. These most frequently occur at the margin of tectonic plates a
piece of the Earths crust (or lithosphere).
The surface of the Earth consists of seven major tectonic plates and many
more minor ones; all are in constant movement. As the Arabian plate is
largely contiguous with the borders of the Kingdom, there is considerable
seismic activity along the borders.
Jeddah and Makkah lie close to the edge of the Arabian plate and are
therefore subject to a surprising number of earthquakes, albeit minor ones,
every year.
Dr. Stewart said the center of the Red Sea is quite active with oceanic sea
floor spreading taking place. There are a number of faults running inland
and a number of big dyke systems as well. There is quite a hefty patch of
activity in the middle its pretty well continually active. Im not overly
worried about living here.
Jeddah and the west coast of the Kingdom are protected from the shocks of
the seismic activity in the Red Sea by a fortunately positioned shock
absorber. Running at a depth of some hundreds of meters below the coastline
from Obhur Creek all the way to Jizan is a thick layer of evaporite a rock
composed of minerals laid down by the evaporation of a solution; in this
case seawater leaving behind wet salt.
This layer behaves, according to Dr. John Robool, geologist at the SGS,
like a large rubber tire acting as a shock absorber. The shocks from the
seismic activity under and near Jeddah are absorbed by this layer. It does
not, however, extend inland as far as Makkah.
Most of the fault movements from the Red Sea are in the center and the
further away toward the Saudi shoreline, they become minimal. One
particularly active center is located in the Suakin Deep, located 70 only
kilometers or so west of Jeddah.
http://www.arabnews.com/services/print/print.asp?artid=70040&d=14&m=9&y=200
5&hl=Makkah%20Quake%20a%20Minor%20Event,%20Says%20Geologist
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.859 / Virus Database: 585 - Release Date: 2/14/2005
_______________________________________________
is-lam mailing list
is-lam@milis.isnet.org
http://milis.isnet.org/cgi-bin/mailman/listinfo/is-lam
Yahoo! for Good
Click here to donate to the Hurricane Katrina relief effort.
_______________________________________________ is-lam mailing list is-lam@milis.isnet.org http://milis.isnet.org/cgi-bin/mailman/listinfo/is-lam
