地震破裂のエンドポイントを予測する
1Center for Neotectonic Studies, Mail Stop 169, University of Nevada, Reno, Nevada 89557, USA. stevew@seismo.unr.edu
Nature
|November 17, 2006
まとめ
地震の断裂は,しばしば断層のステップで停止し,それは伝播の障壁として機能します. 3〜4キロメートルの重要な断層ステップサイズは,断層の長さを制限し,地震リスク評価に影響を与えます.
科学分野:
- 地質学 地質学 地質学
- 地震学 地震学とは
- 地震科学 地震科学 地震科学
背景:
- 地震の断裂は,活発な断層線に沿って広がります.
- 断層の痕跡はしばしば不連続であり,破裂の伝播に影響を与えるステップを特徴としています.
研究 の 目的:
- 地震破裂の長さを制限する断層不連続性の役割を調査する.
- 破裂の拡散を阻害する重要な故障ステップの次元を特定する.
主な方法:
- 歴史上の22のストライクスリップ地震の地図化された表面破裂痕跡の分析.
- 破裂のエンドポイントと故障段階の特徴の関係に関する統計的調査.
主要な成果:
- ストライクスリップ地震の破裂エンドポイントの約3分の2は,断層ステップまたは断層末端と一致しています.
- 3〜4キロメートルの限界断層段階の寸法が特定され,その上では破裂はめったに広がらない.
- この臨界寸法以下では,破裂の伝播は約40%停止する.
結論:
- 断層のステップは,地震の断裂の長さを制御する上で重要な役割を果たします.
- 特定されたクリティカル・フォールト・ステップの次元は,地震リスク分析と地震動態の理解に不可欠です.
- 制限寸法は,地震破裂全体の長さとは大きく独立しており,破裂フロントにおける一貫したストレス変化のダイナミクスを示唆しています.
関連する概念動画
End Point Prediction: Gran Plot
A Gran plot is used to predict the equivalence volume or endpoint of a potentiometric or acid-base titration without reaching the endpoint. Typically, titration data is collected as a function of the titrant's volume up to a point less than the equivalence volume and then transformed into a linear format. The straight line is extended to the x-axis, indicating the necessary titrant volume to achieve the equivalence point.
For potentiometric titration, the Gran plot is created by plotting the...
For potentiometric titration, the Gran plot is created by plotting the...
Stress-Strain Diagram - Brittle Materials
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
Fault Types
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
For line-to-line faults occurring between phases B and C, the...
Types of Building Separation Joints
Building separation joints divide large or complex building structures into smaller, discrete units that can move independently. These joints are categorized into three types: volume-change joints, settlement joints, and seismic separation joints.
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200 feet...
Volume-change joints address the effects of expansion and contraction due to temperature and moisture variations. They are strategically placed at discontinuities in a building's mass where cracking is most likely and are spaced about 150 to 200 feet...
Microcracking in Concrete
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
Ending Relationships
The dissolution of intimate relationships presents complex emotional and psychological challenges, particularly when emotional bonds are strong, the relationship is long-standing, and perceived alternatives are limited. This distress often intensifies in romantic breakups, where the initiator may experience greater turmoil than the rejected partner. Contributing factors include residual attachment, guilt over causing pain, and uncertainty about how to manage the situation. The stress is further...


