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
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 1897-2009 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.
JAVA Major Tectonic around Indonesia and fault source zone The team of Indonesia`s Earthquake Map Revision, 2010
Period 1900-2010 The team of Indonesia`s Earthquake Map Revision, 2010
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.
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
Robert Hall (2000) Robert Hall (2000) LITERATURE REVIEW
Cross-section across Java Island (Katili, 1974)
There are 5 (five) faults: The team of Indonesia`s Earthquake Map Revision (2010)
Irwan Meilano (2006)
Awata, Y., et al, 2010
Alexander R. M., et al. (2003)
The team of Indonesia`s Earthquake Map Revision (2010)
Classification of Earthquake According to Richter scale of earthquake magnitude. Magnitude Level Category Effects Earthquakes per year 5.0-5.9 moderate some damage to weak structures 6.0-6.9 strong moderate damage in populated areas 7.0-7.9 major serious damage over large areas; loss of life 8.0 and great severe destruction and higher loss of life over large areas 200-2,000 20-200 3-20 fewer than 3
Classification of Earthquake According to The Focal Depth Types Depth percentage Shallow earthquakes 0 70 km 85 % intermediate earthquakes 70 300 km 12 % deep earthquakes 300 700 km 3 %
Earthquake Source Zones
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
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.
RESULT Collecting Data Mag. Date Time Lat Lon Depth Code M MW 01-11-12 12:01.8-6.762 107.529 142.1 277 5.70 MB 03-04-11 06:40.4-9.848 107.693 14 282 6.70 ML 23-03-11 07:32.8-9.39 114.019 52.6 284 5.00 MD 08-02-11 27:00.1-9.996 113.88 50.3 282 5.20 MS 21-12-10 59:38.3-8.7 111.197 54.6 277 5.60 The total data of earthquake is 1172 events with different magnitude scale.
Converting to M w Conversion correlation Number of Data Range of Mag. Consistency (R 2 ) M w = 0.143M S2 1.051M S + 7.285 3.173 4.5 Ms 8.6 93.9% M w = 0.114M B2 0.556 M B + 5.560 978 4.9 M B 8.2 72.0% M w = 0.787M E + 1.537 154 5.2 M E 7.3 71.2% M B = 0.125M L2-0.389 M L + 3.513 722 3.0 < M L < 6.2 56.1% M L = 0.717M D + 1.003 384 3 M D 5.8 29.1%
All Shocks Recorded Between 1950-2012
Analyzing Data depend on earthquake classification
Mapping All of event depend on Earthquake Classification
All Shocks to Main Shocks (Seismicity) 1172 Events
1014 Events
Earthquake Source Zone
Subduction Source Zone (selection)
Subduction Event (0-50 KM)
Selection of Non-Subduction Zone
Shallow-Background Event
Deep-Background Event
Fault Event
All of Event Depend on Source Zone
b-value 1- For Subduction Zone
2- For Shallow Background
3- For Deep Background
CONCLUSION Java Island is classified to high seismicity area, 1014 main shocks (from 1172 all shocks) recorded within 1950 to 2012. 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%)
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
Alhamdulillah. and