A Comment on the Relationship Between Earthquake Magnitude and Rupture Length

1979 ◽  
Vol 50 (2) ◽  
pp. 3-8
Author(s):  
J. G. Anderson
Keyword(s):  
Earthquake Magnitude ◽  
Rupture Length ◽  
The Relationship

scholarly journals Earthquake-triggered landslides in southwest China

2012 ◽  
Vol 12 (2) ◽  
pp. 351-363 ◽  
Author(s):  
X. L. Chen ◽  
Q. Zhou ◽  
H. Ran ◽  
R. Dong
Keyword(s):  
Southwest China ◽  
Earthquake Magnitude ◽  
The Tibetan Plateau ◽  
Study Region ◽  
Strong Earthquakes ◽  
Landslide Hazards ◽  
Geological Conditions ◽  
Southeastern Margin ◽  
Fault Belt ◽  
The Relationship

Abstract. Southwest China is located in the southeastern margin of the Tibetan Plateau and it is a region of high seismic activity. Historically, strong earthquakes that occurred here usually generated lots of landslides and brought destructive damages. This paper introduces several earthquake-triggered landslide events in this region and describes their characteristics. Also, the historical data of earthquakes with a magnitude of 7.0 or greater, having occurred in this region, is collected and the relationship between the affected area of landslides and earthquake magnitude is analysed. Based on the study, it can be concluded that strong earthquakes, steep topography as well as fragile geological environment, are the main reasons responsible for serious landslides in southwest China. At the same time, it is found that the relationship between the area affected by landslides and the earthquake magnitude in this region are consistent with what has been obtained worldwide. Moreover, in this paper, it is seen that the size of the areas affected by landslides change enormously even under the same earthquake magnitude in the study region. While at the same tectonic place or fault belt, areas affected by landslides presented similar outline and size. This means that local geological conditions and historical earthquake background have an important influence on landslides distribution, and they should be considered when assessing earthquake-triggered landslide hazards at Grade 1 according to ISSMGE.

T-phase radiators in the western Aleutians

1968 ◽  
Vol 58 (1) ◽  
pp. 1-10
Author(s):  
Rockne H. Johnson ◽  
Roger A. Norris
Keyword(s):  
Large Volume ◽  
Main Shock ◽  
Source Location ◽  
Earthquake Magnitude ◽  
The Pacific ◽  
Aleutian Arc ◽  
Relationship Of ◽  
T Phase ◽  
The Relationship

abstract The aftershocks of the Rat Islands earthquake of 4 February 1965 provided a large volume of data for processing with a T-phase source location program. Although the earthquake epicenters were somewhat uniformly distributed through the Rat and Near Islands region, the computed T-phase sources were grouped in six clusters along the Aleutian arc. The clusters are considered to represent radiation from distinct sites along the Aleutian Ridge. These sites are probably submarine promontories which, due to their exposure, radiate energy over broader arcs of the Pacific than do intervening regions. The relationship of T-phase strength to earthquake magnitude varied little among these radiators; however, T phases from sources south of the Aleutian trench were significantly weaker. Identification of the arrivals from separate radiators in the signal from the main shock allowed an estimation of the length and velocity of the faulting. The estimate was 500 km and 3.5 km/sec.

Earthquake Rupture Scaling Relations for Mainland China

2019 ◽  
Vol 91 (1) ◽  
pp. 248-261 ◽  
Author(s):  
Jia Cheng ◽  
Yufang Rong ◽  
Harold Magistrale ◽  
Guihua Chen ◽  
Xiwei Xu
Keyword(s):  
Eastern China ◽  
Mainland China ◽  
Plate Boundary ◽  
Earthquake Magnitude ◽  
Western China ◽  
Scaling Relations ◽  
Rupture Length ◽  
Rupture Area ◽  
Length Width ◽  
Length Scaling

Abstract Magnitude‐rupture scaling relations describe how the length, width, and area of fault rupture vary with earthquake magnitude. These parameters are required in seismic hazard models to fit the models’ earthquakes onto faults and to define the site‐rupture distances needed in ground‐motion prediction equations. We collected the magnitude and rupture parameters of 91 earthquakes in Mainland China and nearby regions to study magnitude‐rupture scaling relations. We find no systematic deviations for the subsurface rupture length (RLD) obtained from different methods versus earthquake magnitude. We performed regressions of RLD versus magnitude and versus rupture width using general orthogonal regression. Then, we derived the relations between rupture area and magnitude. Our relations are not statistically different from the results derived by others using global datasets, if the parameters of the five pre‐1900 great earthquakes in eastern China are not used. However, if the five earthquakes are used, the magnitude‐rupture length scaling relation for large strike‐slip earthquakes in eastern China gives shorter rupture lengths than earthquakes in western China and other plate boundary regions in the world.

Impact of Earthquake Magnitude on Lives Lost During Shock

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Faruk Ibrahim Gaya ◽  
damu Aminu Bara ◽  
Ahmad Abdullahi ◽  
Mu’azu Audu Zanuwa ◽  
Adamu Kamaludeen Muhammad ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Data Analysis ◽  
Natural Disasters ◽  
Natural Environment ◽  
Geological Structure ◽  
Earthquake Magnitude ◽  
History Of ◽  
The Impact ◽  
The Relationship

Earthquake is one of the catastrophic natural disasters in the history of mankind which consumed hundreds and thousandsof human lives every year. Attitude of man in handling natural environment make earthquakes inevitable. The study wasdesign to examine the impact of earthquake magnitude on lives loss during earthquakes. Data adopted for study are solelysecondary data which include; journals, textbooks, published and unpublished document. Sampled was derived using purposivesampling techniques, earthquakes that lives were loss during their occurrence characterized with 6.0Mw and above wereselected as sample. Regression analysis, maps QGIS software, tables and graphs were used for data analysis in study. Theresult of the research indicate a fair relation among studied variables. Figure 1 Multiple R=0.073, Figure multiple=0.454and Figure multiple R=0.452. Multiple R determine the nature of relation between study variables, the close the value ofmultiple R is to 1 the strong the relationship. Which means fair relationship exist between earthquake magnitudes and liveloss during 1990-2019 earthquakes. And R2 result Figure 1, 1% of the lives lost during earthquakes 1990-1999 are determineby earthquake magnitude, R2 result in Figure 4 indicated 21% of the lives lost during earthquakes 2000-2009 are determineby earthquake magnitude and R2 result in Figure 6 demonstrate 20% of the lives loss during earthquakes 2010-2019 aredetermine by earthquake magnitudes. Significant F results are Figure 1 significant F =0.613, Figure 4 significant F=0.001 andFigure 6 significant F=0.0004. Two out of the three significant F result indicated that the result of the research is reliablewhile one result indicated that the result is less reliable. However, the result of the research signifies, other factors such aspopulation density of the area where the earthquakes occur, the geological structure of the areas where the earthquake takeplace, the time at which the earthquake occur i.e. night or during daylight and precipitation also trigger earthquakes in a fewkilometer depth influence number lives lost during earthquake.

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