1993年5月17日,カリフォルニア州ユーレカ・バレーで発生した地震の表面移転が,SARインターフェロメトリーで観測された
まとめ
1993年のユーレカ・バレー地震は沈下盆地を引き起こし,衛星レーダーは,西に沈む断層の断裂の拡散を示した. この研究は,地震のダイナミクスと表面破裂を明らかにしています.
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
- リモートセンシング (リモートセンサー)
背景:
- ユーレカ・バレー地震 (Mw 6.1) は,1993年5月17日に発生しました.
- 地震の破裂過程を理解することは,地震の危険性評価に不可欠です.
研究 の 目的:
- ユーレカ渓谷地震の表面変形と破裂の特徴を分析するために.
- 観測された変形を地震の発生源メカニズムと断層幾何学と調和させるため.
主な方法:
- 衛星による合成開口レーダー干渉測定 (InSAR) を使用して,表面の移動をマッピングしました.
- 短い空間スケールでのミリメートルの精度でInSARデータの分析.
- InSARによる変形を余震分布と焦点メカニズムソリューションと比較.
主要な成果:
- 北北西向きの長方形の沈殿盆が特定されました.
- イベントに関連した主な表面破裂は明確に描かれていました.
- 観察された変形は,深さで開始された破裂を示唆し,対角的に上方および南方へ広がった.
結論:
- 地震の断裂は,西に沈み,北北東に突入する正規断層で発生した.
- 破裂により,サライン山脈の重要な斜面が再活性化しました.
- InSARは,微妙な表面破裂を特定し,地震の破裂動態を理解するための貴重なツールです.
関連する概念動画
Precipitation Gravimetry
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Elastic Collisions: Case Study
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
Distance Measurements by Taping
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
Atomic Emission Spectroscopy: Interference
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Geoid and Ellipsoid
The Earth's shape is best described as an ellipsoid, a slightly flattened sphere created by rotating an ellipse around its minor axis. This flattening results in the polar axis being about 21 kilometers shorter than the equatorial axis. In contrast, the geoid represents the Earth's gravitational shape and aligns with the mean sea level (MSL). The geoid is an irregular equipotential surface where gravity is perpendicular at every point. Variations in Earth's mass distribution cause geoid...

