Tsunami di Jepun 11.3.2011

Tsunami

Pengenalan:

Tsunami adalah gelombang laut yang disebabkan oleh gempa bumi , tanah longsor atau letusan gunung berapi yang terjadi di laut. Gelombang tsunami dapat merambat ke segala arah.Gelombang tsunami bergerak dengan kecepatan ratusan kilometer per jam di lautan dalam dan dapat melanda daratan dengan ketinggian gelombang mencapai 30 m atau lebih. Magnitudo Tsunami yang terjadi di Indonesia berkisar antara 1,5-4,5 skala Imamura, dengan tinggi gelombang Tsunami maksimum yang mencapai pantai berkisar antara 4 - 24 meter dan jangkauan gelombang ke daratan berkisar antara 50 sampai 200 meter dari garis pantai.

Punca:

1.    Longsoran(Landslide) di bawah laut

2.    Gunung berapi di bawah laut

3.    Gempa bumi tektonik berpusat di bawah laut 

4.  Jatuhnya/hantaman meteor ke dalam laut 

     Tanda-tanda berlaku tsunami:

      1.      Air laut yang surut secara tiba-tiba.

      2.      Bau asin yang sangat menyengat.

      3.      Dari kejauhan tampak gelombang putih dan suara gemuruh yang sangat keras.

      Kejadian tsunami:

      1.      Gempa besar dengan kekuatan gempa > 7.0 SR

      2.      Lokasi pusat gempa di laut

      3.      Kedalaman < 70 Km

      4.      Terjadi deformasi vertikal dasar laut

Careers in Geography

Geographers work in such diverse fields that few jobs have “geography” in their titles. The following is a representative sample of job titles that a geographer might have: 

Business Location Analyst Cartographer Cartographic Technician Climatologist Computer Mapper Demographer Earth Scientist 911 Coordinator Environmental Impact Analyst       GIS Analyst / Programmer GIS Coordinator GIS Technician Geospatial Data Analyst Geographer Geographic Specialist Hydrologist Intelligence Analyst Land Use Planner Market Area Analyst Park Ranger Physical Scientist Real Estate Agent Regional Census Technician Remote Sensing Analyst School Teacher Soil Conservationist Travel Agent Urban / Regional Planner

What is GIS?

A geographic information system (GIS) integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information.
GIS allows us to view, understand, question, interpret, and visualize data in many ways that reveal relationships, patterns, and trends in the form of maps, globes, reports, and charts.
A GIS helps you answer questions and solve problems by looking at your data in a way that is quickly understood and easily shared.
GIS technology can be integrated into any enterprise information system framework.

Geography is the science of our world

"Geography is the science of our world, and using and sharing geographic knowledge is the key to our future."

—Jack Dangermond, Esri President

 

About GEOgraphy

Geography (from Greek γεωγραφία - geographia, lit. "earth describe-write") is the science that deals with the study of the Earth and its lands, features, inhabitants, and phenomena. A literal translation would be "to describe or write about the Earth". The first person to use the word "geography" was Eratosthenes (276-194 BC). Four historical traditions in geographical research are the spatial analysis of natural and human phenomena (geography as a study of distribution), area studies (places and regions), study of man-land relationship, and research in earth sciences.Nonetheless, modern geography is an all-encompassing discipline that foremost seeks to understand the Earth and all of its human and natural complexities—not merely where objects are, but how they have changed and come to be. Geography has been called 'the world discipline'.As "the bridge between the human and physical sciences," geography is divided into two main branches—human geography and physical geography.
                                                                                                                                
From Wikipedia