Using ArcGIS to Analyze Earthquake Patterns in Java Island, Indonesia

Transcription

1 Using ArcGIS to Analyze Earthquake Patterns in Java Island, Indonesia Presented By: Abdul Latif Ashadi For GIS Course (CRP 514) section 01 Instructor: Dr. Baqer M. Al-Ramadan

2 INTRODUCTION Indonesia Region, famous as "supermarket of disaster", is located in a tectonically very complex and very active area. The high seismic activity in Indonesia was revealed by the record quake in the span of there are more than 14,000 earthquakes with magnitudes M 5.0. Java islands was selected for this research because most of the population, infrastructure and structure facilities are concentrated in this island.

3 JAVA Major Tectonic around Indonesia and fault source zone The team of Indonesia`s Earthquake Map Revision, 2010

4 Period The team of Indonesia`s Earthquake Map Revision, 2010

5 OBJECTIVES To map seismicity of Java Island. To know characteristic of earthquake classification in Java Island. To know earthquake source zone. To calculate b-value.

6 METHODS Collecting Data from IRIS catalogue for area of 5 S -12 S and 105 E -115 E The period is 1950 to 2012 Converting Magnitude Scale Into Mw Analyzing Data Classification according to magnitude Classification according to the focal depth Declustering Analyzing earthquake source zones Calculating b-value

7 Robert Hall (2000) Robert Hall (2000) LITERATURE REVIEW

8 Cross-section across Java Island (Katili, 1974)

9 There are 5 (five) faults: The team of Indonesia`s Earthquake Map Revision (2010)

10 Irwan Meilano (2006)

11 Awata, Y., et al, 2010

12 Alexander R. M., et al. (2003)

13 The team of Indonesia`s Earthquake Map Revision (2010)

14 Classification of Earthquake According to Richter scale of earthquake magnitude. Magnitude Level Category Effects Earthquakes per year moderate some damage to weak structures strong moderate damage in populated areas major serious damage over large areas; loss of life 8.0 and great severe destruction and higher loss of life over large areas 200-2, fewer than 3

15 Classification of Earthquake According to The Focal Depth Types Depth percentage Shallow earthquakes 0 70 km 85 % intermediate earthquakes km 12 % deep earthquakes km 3 %

16 Earthquake Source Zones

17 The Gutenberg-Richter magnitude frequency relationship The common description of the frequency of earthquakes: Log 10 N(M) = ɑ - bm N(M) is the number of earthquakes that occur in a specific time window with magnitude M, M the magnitude, ɑ and b are constants

18 The b-value equals the slope of the frequency-magnitude distribution (FMD), and describes the relative size distribution of earthquakes. A higher b-value indicates a relatively larger proportion of small events. The ɑ-value indicates the seismic activity.

19 RESULT Collecting Data Mag. Date Time Lat Lon Depth Code M MW : MB : ML : MD : MS : The total data of earthquake is 1172 events with different magnitude scale.

20 Converting to M w Conversion correlation Number of Data Range of Mag. Consistency (R 2 ) M w = 0.143M S M S Ms % M w = 0.114M B M B M B % M w = 0.787M E M E % M B = 0.125M L M L < M L < % M L = 0.717M D M D %

21 All Shocks Recorded Between

22 Analyzing Data depend on earthquake classification

23 Mapping All of event depend on Earthquake Classification

24 All Shocks to Main Shocks (Seismicity) 1172 Events

25 1014 Events

26 Earthquake Source Zone

27 Subduction Source Zone (selection)

28 Subduction Event (0-50 KM)

29 Selection of Non-Subduction Zone

30 Shallow-Background Event

31 Deep-Background Event

32 Fault Event

33 All of Event Depend on Source Zone

34 b-value 1- For Subduction Zone

35 2- For Shallow Background

36 3- For Deep Background

37 CONCLUSION Java Island is classified to high seismicity area, 1014 main shocks (from 1172 all shocks) recorded within 1950 to According to richter scale of magnitude, all socks are divided into moderate (90.70%), strong (9.13%) and major (17%). According to focal depth, all socks are divided into shallow (67.92%), intermediate (27.24%) and deep (4.44%)

38 Java Island has 4 earthquake source zone: subduction, shallow background, deep background and fault. For subduction, b-value= 1.13 and ɑ- value=6.81 For shallow background, b-value= 2.37 and ɑ-value=13.8 For deep background, b-value= 1.65 and ɑ-value=10.1

39 Alhamdulillah. and