地震学:スマトラ地震の速度と大きさ
1Department of Geological Sciences, Northwestern University, Evanston, Illinois 60208, USA. seth@earth.northwestern.edu
Nature
|April 1, 2005
まとめ
2004年のスマトラ・アンダマン地震は,以前考えられていたのより2.5倍大きめで,1,200kmの断層に沿ってストレスを放出しました. 記録された地震で2番目に大きいこの大きな地震は,蓄積されたストレスを放出し,この特定の地域で即時の津波のリスクを軽減しました.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- 2004年のスマトラ・アンダマン地震は,広範囲にわたる破壊と大規模な津波を引き起こしました.
- 初期の大小の推定は,イベントの規模を完全に捉えていない可能性があります.
研究 の 目的:
- 2004年のスマトラ・アンダマン地震の規模と断裂の特徴を再評価する.
- 地震性ストレンの放出と関連する津波発生の可能性を評価する.
主な方法:
- 地震学データの分析により,地震の規模と断層の滑り方を決定する.
- 断層破裂の拡散とエネルギー放出のモデリング.
主要な成果:
- 地震のマグニチュードは,当初報告されたの2.5倍で,記録された地震の中で2番目に大きい地震となった.
- 1,200kmの断層滑りが発生し,長い破裂期間と大きなエネルギー放出を示しています.
- 破裂地帯全体が滑り落ち,インド・ビルマプレート沈下からの累積した圧力が放出されました.
結論:
- 2004年のスマトラ・アンダマン地震は,以前よりもかなり大きく,以前よりも長い断裂がありました.
- プレート境界のこのセグメントに沿ったストレスの完全な解放は,同様の津波の即時のリスクを軽減します.
- 将来の地震と津波の脅威は,南のプレート境界の他のセグメントから可能である.
さらに関連する動画
06:55Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
7.3K
07:58Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
8.9K
関連する概念動画
00:58Energy and Power of a Wave
4.3K
The total energy associated with a wavelength is the sum of the potential energy and the kinetic energy. The average rate of energy transfer associated with a wave is called its power, which is total energy divided by the time it takes to transfer the energy. For a sinusoidal wave, energy and power are proportional to the square of both the amplitude and the angular frequency.
Waves can also be concentrated or spread out, as characterized by the intensity of the wave. Intensity is directly...
Waves can also be concentrated or spread out, as characterized by the intensity of the wave. Intensity is directly...
4.3K
01:06Physical Pendulum
2.9K
When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°.
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it...
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it...
2.9K
01:12Measuring Acceleration Due to Gravity
1.4K
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
1.4K
01:13Speed of a Transverse Wave
3.0K
The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
One of the key properties of any wave is the wave speed. Light...
3.0K
01:29Distance Problem
219
When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
219
01:30Geometric Sequences
400
In systems where values diminish by a constant proportion at each stage, the resulting sequence follows a geometric structure. Each new value in the sequence is obtained by applying a fixed multiplier to the preceding term. This regular, proportional decline type is often used to represent processes involving gradual loss, such as energy dissipation or reduction in amplitude over time.When analyzing the total effect of such a process across unlimited iterations, the series of values is referred...
400