what is geophysics all about

7/25/2019 What is Geophysics All About

1/17

Jadwal perkuliahan: Sabtu, Jam 1-2 (Genap), Jam 3-4 (Ganjil) Ruang: Lt.4 ?

Kontrak perkuliahan:

* Kehadiran

* Kuis/Tugas

* UTS

* Kuis/Tugas

* UAS

Referensi: - Fundamental of Geophysics

(W. Lowrie)- Whole Earth Geophysics (Robert J Lillie)

- Applied Geophysics (Telford, et all)

- Internet (berbagai sumber)

Geofisika Umum


2/17


3/17

Geophysics of the Solid Earth:

1. Structure and composition of the Earth's

Interior

-Scales: 1000's of km to a few meters

2. Understanding the large scale forces at work

-Plate Tectonics

-Mantle Convection-Evolution of the Core


4/17

Continue

3. Earth History

-Paleomagnetism

-Radioactive decay

4. Measuring and predicting the 4D structure of

the Earth's potential fields

-Gravity (satellites and missiles)-Electromagnetics (communications)


5/17

Continue

5. Hazard assessment and mitigation

-Earthquakes

-Volcanos

-Sinkholes

-Cracks in foundations and tunnels

6. Archeology and Forensics

-Titanic

-Grave sites


6/17

Continue

7. Resource location and evaluation

-Minerals-Oil

-Water-Geothermal

8. Waste Management

-Impacts on other fields:-Signal Processing-Imaging and Inverse Theory


7/17

Like many disciplines, Geophysical activities

may be conveniently divided into "applied"

and "theoretical" subdisciplines.


8/17

Applied Geophysics:

The Earth produces a variety of signals that we canmeasure and try to interpret to our advantage. Amongthe most important of these are: The Gravitational Field: A product of density variations in

the Earth The Magnetic Field: A combination of deep (Core) and

shallow (Remanent) sources

Electrical Signals: Resistivity, Induced Polarity, NaturalPotentials

Elasticity: Measured by the propogation of seismic waves Heat Flow: A function of radioactive decay and active

tectonics

Active Deformation: Plate motions


9/17

Theoretical Geophysics, or

Geodynamics:

What can the laws of Physics tell us about how a planetshould behave? We worry about questions like what makesplates flex; how do rocks break or otherwise deform, howdo fluids make their way through the Earth; what happensas hot bodies cool?

These two subdisciplines naturally are related, it's only aquestion of emphasis. In particular, the former field is muchmore focussed on data processing issues.

Before we get into the meat of Geophysics, let's start byreviewing a few basic ideas:

1. The History of the Universe, and a bit of the Earth's

2. The Internal Structure of the Earth (mostly radial)

3. The Basics of Plate Tectonics


10/17

Secara praktis, metode yang umum digunakan di dalam

geofisika tampak seperti tabel di bawah ini:


11/17


12/17


13/17

Atmospheric sciences

Remote Sensing

Seismology Space physics

Tectonic & sedimentation

Volcanology

Geophysical interesting


14/17

Microsoft Encarta Reference Library 2005. 1993-2004 Microsoft Corporation.All rights reserved:

geophysics ,noun

science of Earths physical processes: the branch of earth science thatdeals with the physics and physical processes of the Earth, especially usingnoninvasive techniques, for example, acoustic surveys of the structure of

rocks -geophysical, adjective

-geophysically, adverb-geophysicist], noun

Kamus Bahasa Indonesia, Pusat Bahasa Depdiknas RI:

geofisika: ilmu tt sifat-sifat alami bumi (panas, magnetisme, dsb) dan gejala-gejalanya (mencakupi bidang-bidang meteorologi, oseanografi, seismologi,vulkanologi, magnetisme, dan geodesi)


15/17

FISIKA BUMI PADAT

MAGNIT BUMI

GAYA BERAT DAN PASANG SURUT BUMI

SEISMOLOGI

HIDROLOGI

VULKANOLOGI

KELISTRIKAN BUMI

METEOROLOGI


16/17

The International Union of Geodesy and Geophysics

(IUGG) is the international organization dedicated to

advancing, promoting, and communicating

knowledge of the Earth system, its spaceenvironment, and the dynamical processes causing

change.

ORGANISASI PROFESI GEOFISIKA


17/17

end

what is geophysics all about

Documents