gelombang iii - blogs.unpad.ac.idblogs.unpad.ac.id/myawaludin/files/2012/06/gelombang_3.pdf½...
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![Page 1: Gelombang III - blogs.unpad.ac.idblogs.unpad.ac.id/myawaludin/files/2012/06/Gelombang_3.pdf½ lingkaran bumi Tarikan gravitasi, rotasi bumi. Garison (2004) ... melewati permukaan dengan](https://reader037.vdocuments.site/reader037/viewer/2022100303/5c95542309d3f2de7d8c6ad4/html5/thumbnails/1.jpg)
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oleh : muhammad yusuf awaluddin
Gelombang III
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A lil’ bit outline
Standing waves or Seiche
Tsunami
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Tipe gelombang berdasar wavelength nya :
Tipe Gelombang Tipikal panjang
gelombang
Penyebab
Wind wave 60 – 150 m Angin di laut
Seiche Besar dan
bervariasi
Perubahan
tekanan atmosfer,
badai, tsunami
Tsunami 200 km Patahan dasar
laut, gunung
meletus, landside
Tide (Pasang
surut)
½ lingkaran bumi Tarikan gravitasi,
rotasi bumi.
Garison (2004)
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Standing waves / seiches dicirikan oleh
permukaan air yang naik-turun.
Suatu node (simpul) : garis imajiner yg
melewati permukaan dengan tidak
mengalami perubahaan elevasi saat
standing wave ber-osilasi.
Antinode : merupakan maksimum
perubahan suatu permukaan permuaan
saat berosilasi. Biasanya terjadi pada
ujung suatu cekungan.
7-4Standing Waves
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Natural Period of Standing Waves
Garison (2004)
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Geometry dari suatu cekungan mempengaruhi
periode standing wave. Cekungannya dapat
terbuka atau tertutup.
Standing waves dapat ditimbulkan oleh storm
surge (kenaikan permukaan laut sebagai akibat
rendahnya tekanan atmosfir dan akumulasi dari
air yang menuju pantai yg dibangkitkan oleh
badai)
Standing wave muncul karena berosilasi secara
vertikal dan tidak ada pergerakan maju.
7-4Standing Waves
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Example :
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From UNESCO/PTWC tsunami booklet
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"Tsunami" – Bahasa Jepang yg “harbor wave".
Merupakan bagian dari gelombang lautan yang disebebkan pleh pergeseran lempeng
tektonik atau aktifitas vulkanik,dll.
The Great Wave off Kanagawa by
Katsushika Hokusai (1760-1849)
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BANDA ACEH : June 23, 2004
Gambar satelit sebelum terjadinya tsunami
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BANDA ACEH: December 28, 2004
Gambar satelit diambil setela tsunami.
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Tsunami
Tsunami terminology :
Often called “tidal waves” but have nothing to do
with the tides
Japanese term meaning “harbor wave”
Also called “seismic sea waves”
Dihasilkan oleh pergerakan dari dasar lautan :
Pergerakan lempeng tektonik dasar laut
Patahan dasar laut
Aktifitas tektonik gunung dasar laut
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Tsunami Sources
Earthquakes (e.g. Honshu, 2011; Sumatra, 2004: >200,000 people killed; Papa New Guinea, 1998: ~3,000 people killed)
Volcanic eruptions (e.g. Krakatoa, 1883: tsunamis killed 30,000 people; Santorini, 2002).
Mass Movement (e.g. Alaska, 1958: waves up to 518 m high formed in Lituya Bay).
Extraterrestrial Impacts - large impacts have the potential to create enormous tsunamis.
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Generation of a Tsunami
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Tsunami Genesis
Tsunamis are
caused by events
that drastically and
suddenly shift a
large volume of
water.
From Plummer McGeary Carlson
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Most tsunami originate
from underwater fault
movement
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Karakteristik Tsunami
Berefek pada keseluruhan kolom air
sehingga dapat membawa energi yg
lebih besar dari gelombang permukaan.
Dapat memiliki kecepatan hingga lebih
dari 700 kilometer per jam.
Memiliki gelombang yg kecil di laut
terbuka.
Mengakibatkan tinggi yang ekstrim saat
mencapai pantai
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Efek di Pantai
Bila puncak gelombang yg datang terlebih
dahulu, maka akan menimbulkan penarikan air
yang sangat kuat.
Apabila puncak gelombang yang terlebih dahulu
sampai di pantai maka akan mengakibatkan
hentakan gelombang yang kuat dan
meningkatkan level air laut membanjiri daratan.
Tsunami seringkali muncul sebagai rangkaian
penarikan dan hentakan gelombang.
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Sumatra Tsunami 2004
An emergency reaction example (Benz, USGS)
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Tsunami since 1900
Sebagian besar
tsunami berada
diantara batas
Pacific Ocean dan
sepanjang the
Pacific “Ring of Fire”
Sumatera 2004
Honshu/Sendai 2011
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An ExampleTsunami Wave Example: Sumatra 2004
How long does it take to get to Sri Lanka?
Distance ~1600 km
Water Depth ~4000 m
T= 2000/713=2.2 hr
v gD 9.8* 4000 198m
s 713
km
hr
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An ExampleTsunami Wave Example: Sumatra 2004
How long to get to Thailand?
Distance ~500 km
Water Depth ~1500 m
T= 500/430=1.1 hr
v gD 9.8*1500 120m
s 430
km
hr
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An Example
Tsunami Wave Example: Sumatra 2004
“Correct” numerical model using observed source and high definition bathymetry of the front propagation
Courtesy: K. Satake, unpublished
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An ExampleTsunami Wave Example: Sumatra 2004
How high is the wave?
HD12
HD22vD2
vD1gD2
gD1
1
1
2
HD1
2
HD2
20.62
HD2
2gD2
gD1
9.8*10
9.8* 4000 HD2 7.6m
NOAA
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
9090 100
0
1 minutes after OT
Northern SumatraPeople are sensing severe
shaking
NEICNo information regarding
earthquake
PTWCNo information regarding
earthquake and/or tsunami
P S
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
10 minutes after OT
Northern SumatraSignificant structural damage
in Banda Aceh
Tsunami inundation along the
Sumatran coast
EQ is widely felt throughout
the region
NEICShort period alarm on eight
stations in the region
PTWCShort period alarm on western
Pacific stations
P S
Short-period alarm stations
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10 minutes after OT
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10 minutes after OT
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
90
0
12 minutes after OT
Northern SumatraTsunami inundation spreads
further along the Sumatran
coast
NEICShort period alarm on sixteen
stations In the region
Mb6.2, Mwp8.2 earthquake
located off the north coast of
Sumatra
Pager notification to duty
seismologists and others at
NEIC
PTWCMwp8.2 earthquake located
off the north coast of Sumatra
No tsunami advisor for the
Pacific Ocean
P S
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
16 minutes after OT
P S
Northern SumatraTsunami inundation spreads
further along the Sumatran
coast and reaches the
Nicobar Islands
NEICFirst automatic location released
at NEIC
Pager notification to about 10
people in the USGS
PTWCConfers with NEIC on the
location and magnitude of the
Earthquake
Release Tsunami Information Bulletin
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01:14 WC&ATWC Tsunami Information
Bulletin
Location 3.4 N, 95.7 E
BASED ON LOCATION AND MAGNITUDE THE EARTHQUAKE WAS NOT
SUFFICIENT TO GENERATE A TSUNAMI DAMAGING TO CALIFORNIA -
OREGON - WASHINGTON - BRITISH COLUMBIA OR ALASKA. SOME
AREAS MAY EXPERIENCE SMALL SEA LEVEL CHANGES. IN AREAS OF
INTENSE SHAKING LOCALLY GENERATED TSUNAMIS CAN BE
TRIGGERED BY SLUMPING. THE PACIFIC TSUNAMI WARNING
CENTER WILL ISSUE TSUNAMI BULLETINS FOR HAWAII AND OTHER
AREAS OF THE PACIFIC.
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16 minutes after OT
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16 minutes after OT
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30 minutes after OT
M5.5
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34 minutes after OT
M5.5
M6.1
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39 minutes after OT
M5.5
M6.1
M6.0
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43 minutes after OT
M5.5
M6.1
M6.0
M5.5
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
90
0
44 minutes after OT
Northern SumatraTsunami is passing thru the
Nicobar Islands
NEICAutomatic Ms magnitude is
calculated (Ms8.5)
Pager notification to about 30
people in the USGS
Aftershocks suggest Ms8.5 is
too low
PTWCConfers with NEIC on the
location and magnitude of the
earthquake
Notifies US Military on Diego
Garcia on the possibility of
an approaching tsunami
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
0
90
75 minutes after OT
Northern SumatraTsunami reaches the Andaman
Islands, approaches the Thai
coast
NEICReleases reviewed
earthquake location and
magnitude (Ms8.5)
Pager notifications are sent
to 25,000 people
Call down list is activated
Wire service reports
of collapsed buildings in
Banda Aceh
PTWC
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Telephone Call-Down List
USGS Earthquake Hazards Program Coordinator 02:30 UTC
USGS Office of Communications 02:30
USGS NEIS Coordinator 02:25
White House situation room 02:35
State Department Operations Center 02:36
FEMA Operations Center 02:37
International Commission on
Renal Failure, Alberta, Canada 02:39
EERI
02:42
USGS GHT Chief Scientist 02:27
USGS GHT Chief Scientist 02:29
USGS CR Executive for Geology 02:32
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Msg Agency
Pager/Email USGS Earthquake Program, Reston and Golden
Pager FEMA, Washington DC area
Pager/Email UN Radio Readiness Group, New York
Fax/Email Japan Meteorological Agency, Tokyo
Email Schweizerischer Erdbebendienst, Zurich,Switzerland
Email Servicio Hidrográfico y Oceanográfico de la
Armada, Chile
Email Réseau National de Surveillance Sismique, EOPGS,
Strasbourg, France
Email Seismic Data Analysis Center, BGR, Hannover,
Germany
Email Russian Academy of Sciences Siberian Branch,
Novosibirsk, Russia
Email GeoForschungsZentrum Potsdam, Potsdam, Germany
Email US Strategic Air Command, Nebraska
Email National Geospatial Intelligence Agency, Virginia
Email European-Mediterranean Seismological Centre,
Bruyères-le-Châtel, France
Email Instituto Geográfico Nacional, Madrid, Spain
Email World Agency of Planetary Monitoring and EQ Risk
Reduction, Geneva
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Recipients of “embassy” news release message
(Sent between 02:21 and about 02:30)
Msg. type Agency
Fax/Email US Embassy Consular Section, Jakarta,
Indonesia
Fax/Email US Consulate General, Surabaya,
Indonesia
Fax/Email US Consular Agent, Denpasar,
Indonesia
Fax UN Office for the Coordination of
Humanitarian Affairs, Geneva, Switzerland
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104 minutes after OT
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104 minutes after OT
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Propagation, Response and Warning Times
for the M9.0 Sumatra EQ
122 minutes after OT
Indian OceanLittle communication from
Banda Aceh
Destruction in Pkuket
Tsunami hits Sri Lanka
NEICContinuing dialogue between
USGS scientists in Golden,
Reston and Menlo Park
No confirmation via wire
services of tsunami in the
Indian Ocean
Wire service reports of
building collapse in Banda
Aceh
Web content is being
developed and posted
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Tsunami Indian Ocean Dec. 26, 2004
• The most powerful earthquake in 40 years
• Measured 9.0 on the Richter scale
• Occurred approximately four miles below the Indian Ocean near
the Indonesian Island of Sumatra.
No tsunami ocean
buoy in Indian Ocean
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Can We Do Better?
Tsunami warning system
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Tsunami: Aceh 2004
That’s all folksTsunami Aceh, 2004
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Wait !!!!!!TUGaS Individu :
Buatlah artikel ilmiah Dengan Tema TWS (Tsunami Warning
System) dan lembaga yg berwenang utk hal tersebut,
misal :
o. BMKG o. USGS o. CSIRO
1. 1500 kata saja tdk termasuk referensi:
2. Cover – Abstrak-Pendahuluan-Isi-Kesimpulan-referensi
3. Due date : 9 Mei 2012 pukul 21.00 ke
TUGaS KELOMPOK :1. Buat POSTER 1 kelompok 1 poster
2. Bentuk Portrait .
3. Dikumpulkan ke Eka tgl 10 Mei 2012
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contoh