:: ~Causes of Tsunami~::

Most tsunamis are generated by underwater earthquakes



Normally, tsunamis are generated by underwater earthquake, it happen when there is a sudden large displacement of water, it produced by convergent or destructive plate boundaries abruptly move and vertically displace the overlying water. Tsunamis also causes by these mechanisms, it may dissipate quickly and rarely effect distant coastlines due to the small sea area affected, the effect can caused huge effect for many human and the countries when it happen. There are three main causes of tsunamis:

1.Seismic Activity

Seismic activity is the most common cause of tsunamis. Both tectonic and subduction earthquakes in and near the ocean may create tsunamis. During a tectonic earthquake, the sea floor becomes deformed, forcing a displacement of water. In a subduction earthquake, tectonic plates slip under each other, creating a massive disturbance, also resulting in a significant displacement of water.







2.Submarine Landslides

Submarine landslides can also cause tsunamis. Submarine landslides occur during earthquakes and the implosion of underwater volcanoes. The falling sediment and rock in these landslides can also trigger massive water movement, resulting in a tsunami.


i)
Submarine earthquake













ii)
Submarine volcano













iii)
Submarine gas bubble erupting
















3.Cosmic Impacts


Cosmic impacts in the ocean are the least frequent cause of tsunamis. This is similar to throwing a rock into a pond, except on a much larger scale. When the rock hits the water, it creates small ripples of water moving away from the point of impact. In a cosmic impact, these ripples would instead be massive tsunamis, increasing in size as they near the shore.

::~Tsunami~::

Hi...everyone, more knowledge about the Natural Disaster had been published in this blog just to share the information with everyone so that appropriate action can be taken to save life. Tsunami is the most horrifies natural disaster which causes by a strong earthquake under the ocean bed. The vibrations travel through the water and could reaches to thousands kilometers from the tragedy location. The giant tsunami effect can destroy an entire country and killing many people. The picture below showed the examples of the destructive power of tsunamis at Acheh city.

-All About Valcano-


The word of volcano was get from the name of Vulcano Island. Volcano is a rupted of planet's

surface which allow hot magma, ash and gases to escape from below the surface.



Volcano can be divided into 3 group:

1. Dormant - volcano that not erupted for a long time but have possibility to erupt again.
2. Extinct - volcano that have erupted for thousands years and might be dead.
3. Active Volcano - volcano that erupt rarely and can be erupted again soon.

Part of Volcano

1. Large magma chamber
2. Bedrock
3. Conduit
4. Base
5. Sill
6. Dike
7. Layers of ash emitted by volcano
8. Flank
9. Layers of lava emitted by volcano
10. Throat
11. Parasitic cone
12. Lava flow
13. Vent
14. Crater
15. Ash cloud

Types of Volcano

Volcanoe because of repeated of ereptions. There are some tyoes of volcano based on their types of material:

1. Stratovolcano - buils from eruptions of lava and tephra that pile up in layers like cake. These type of volcanoes form symmetrical cones withsteep sides.
   


2. Cinder Cone Volcano - buils from erupting lava that rupture into small pieces. Lava pieces move downward to the ground, it cool and become harden into cinders. Cinder cone.


3. Shield Volcano - form from eruptions of flowing lava. Lava spread up and form gentle sloping slope. These shape are resembles a warrior's shield.

:: ~Types for Hurricane~::

1. Hurricane Andrew







 Parts of Homestead, Florida, lie in ruins after Hurricane Andrew tore through the area with Category 5 winds. Andrew follows Katrina as the second-most destructive U.S. hurricane on record, with winds topping 164 miles (264 kilometers) per hour.



2. Hurricane Allen







Palm trees bend as Hurricane Allen lashes the Texas Gulf Coast with 100-mile-per-hour (160- kilometer-per-hour) winds in 1980. Hurricanes form over warm water that is at least 80 degrees Fahrenheit (27 degrees Celsius)



3. Hurricane Ivan







Storm surge from Hurricane Ivan cut a channel through this barrier island near Pensacola, Florida. The Category 5 storm was the strongest of the 2004 Atlantic hurricane season.



4. Surfing a Hurricane








Two daring beachgoers brave hurricane-driven surf in North Palm Beach, Florida. Hurricanes that hit the U.S. East Coast typically form over the tropics between June and November.



5. Wind and Rain, Florida







Wind and rain pummel a building and surrounding palm trees during a hurricane in Florida. The state's location between three bodies of water—the Atlantic Ocean to the east, Gulf of Mexico to the west, and Florida Straits to the south—makes it especially prone to hurricanes.



6. Flying through Hurricane's Eye







After slicing through violent wind, rain, hail, and updrafts, a National Oceanic and Atmospheric Administration P-3 plane flies in the calm eye of Hurricane Caroline. Specially equipped NOAA aircraft collect meteorological data from the upper atmosphere for hurricane forecasting.

::~How Hurricane Happen~::

Hurricanes happen when the oceans waters have been warmed with surface temperature of at least 80 degrees Fahrenheit (26.5 degrees Celsius) during summer months. These low pressure systems are fed by energy from the warm seas. If a storm achieves wind speeds of 38 miles (61 kilometers) an hour, if becomes knows as a tropical depression from tropical storm. When a storm’s sustained wind speed reaches 74 miles (119 kilometers) an hour it becomes a hurricane and earns a category rating of 1 to 5on the Saffir-Simpson scale. In the North Atlantic, hurricane season is from June 1 to November 30.

-:: What are Hurricanes..??-::-

Hurricane are huge storms, it can be up to 600 miles across and have strong winds speeds over 160 miles(257 kilometers) an hour and unleash more than 2.4 trillion gallons (9 trillion liters) of rain a day, These same tropical storms are known as cyclones. The center of the storm is the calmest part or it also can call the eye and has only light winds and fair weather, the low level storm winds blow counterclockwise around the eye in the Northern Hemisphere(clockwise in the Southern Hemisphere), and above 9 km, wind spiral outwards and clockwise in the Northern Hemisphere.









Hurricanes are enormous heat engines that generate energy on a staggering scale. They draw heat from warm, moist ocean air and release it through condensation of water vapor in thunderstorms. Hurricanes spin around a low-pressure center known as the “eye.” Sinking air makes this 20- to 30-mile-wide (32- to 48-kilometer-wide) area notoriously calm. But the eye is surrounded by a circular “eye wall” that hosts the storm’s strongest winds and rain.


Hurricane has 6 categories based on their scale for wind speeds are:
Categories 1 – has sustained winds from 74 to 95 mph.
Categories 2 – has sustained winds from 96 to 110 mph.
Categories 3 – has sustained winds from 111 to 130 mph.
Categories 4 – has sustained winds from 131 to 155 mph.
Categories 5 – has sustained winds greater than 155 mph.
Categories 6 – would be greater than 175 or 180 mph

~Floods Warning~

Map above is a picture of the states whose Automated Flood Warning System (AFWS) are part of an IFLOWS network.

The symbols above showed Automated Floods Warning System (AFWS) is a cooperative effort managed by the IFLOWS Program of the National Weather Service.This program can give more information about floods categories, text products, shapefiles, and KML/KMZ files, all the information can help many people to get ready before floods disaster will come.