On the potential seismic hazard in Hong Kong

Lee, C F; Yang, Hong; Qing, Zhou

doi:10.18814/epiiugs/1997/v20i2/004

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1997

DOI: 10.18814/epiiugs/1997/v20i2/004

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On the potential seismic hazard in Hong Kong

C F Lee¹,

Hong Yang²,

Zhou Qing³

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Cited by 11 publications

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Fractal Geometry of Faults and Seismicity of Koyna-Warna Region West India Using LANDSAT Images

Sunmonu¹,

Dimri

2000

Pure appl. geophys.

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The Koyna-Warna region has been shaken by several earthquakes greater than magnitude 4 in the last 35 years. Four of them in 1967Four of them in , 1973Four of them in , 1980Four of them in and 1993 were potentially very destructive with magnitudes exceeding 5.0. The majority of seismic events recorded to date has been induced from Koyna-Warna reservoir areas. This paper discusses the fractal analysis of a fault map from LANDSAT images with the increasing seismic activity in the region. The region is divided into six blocks and the fractal dimension of each block is calculated using a box-counting technique. A plot of a three-dimensional map of the fractal dimension is prepared. It shows that the value of the fractal dimension is gently dipping from NE to SW. The fractal dimension is used to estimate the b-6alue in the frequency-magnitude relation of earthquakes in the region which is in agreement with earlier studies.

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Fractal Geometry of Faults and Seismicity of Koyna-Warna Region West India Using LANDSAT Images

Sunmonu¹,

Dimri

2000

Pure appl. geophys.

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Fractal Dimensions of Blocks Using a Box-counting Technique for the 2001 Bhuj Earthquake, Gujarat, India

Ram

Roy

2005

Pure appl. geophys.

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Several destructive earthquakes have occurred in the Kachchh region of Gujarat during the past two centuries, among them Allah Bund earthquake (M7.8) in 1819, Anjar earthquake (M6) in 1956 and the recent Bhuj earthquake (M7.6) in 2001. The Anjar earthquake was on KMF (Kachchh Mainland Fault) and the recent Bhuj events were caused by a hidden fault north of KMF. The present study discusses the fractal analysis of tectonics governing seismic activity in the region. The region has been divided into five blocks and the fractal dimension of each block has been calculated using the box-counting technique. The results show significantly low value of fractal dimension of the Kachchh rift block consisting of the KMF compared to the other surrounding blocks, which also contain faults and rifts of higher fractal dimension. This indicates that the cause of earthquakes in this block may be asperities and barriers. However, the predominance of aftershocks over foreshocks signifies that barriers may be the main cause. The other results, such as the lower value of dimension of fault clustering show that the Kachchh rift block has faults which are distributed in a clustered manner. In this context, the seismicity of this block seems to be high.

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Coda Q estimates in the Hong Kong Region

Mak

Chan

Chandler

et al. 2004

Journal of Asian Earth Sciences

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On the potential seismic hazard in Hong Kong

Cited by 11 publications

References 0 publications

Fractal Geometry of Faults and Seismicity of Koyna-Warna Region West India Using LANDSAT Images

Fractal Geometry of Faults and Seismicity of Koyna-Warna Region West India Using LANDSAT Images

Fractal Dimensions of Blocks Using a Box-counting Technique for the 2001 Bhuj Earthquake, Gujarat, India

Coda Q estimates in the Hong Kong Region

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