MODELING OF WEPAPIS-60 (WESTERN PACIFIC PALEOINTENSITY-STACKING FOR THE LAST 60 THOUSAND YEARS)

• Main Author: Harlianti, Ulvienin
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46532
• Institution: Institut Teknologi Bandung

Earth’s magnetic intensity record can have different values from one to other regions because of regional components such as mineral properties and regional processes. The newest study about paleomagnetism states in 300-600 km depth in the subduction zone still contains hematite mineral that may affect the magnetic intensity around it. To obtain a better resolution paleointensity curve and shows “true” magnetic characters can be done with stacking some paleointensity record from the same or different regions. Paleointensity stacking is done using 6 core data from Western Pacific, this area selected because (1)data from this area has not been represented in the previous PIS; (2)this region has many subduction zones so it can be used to try to prove the influence of hematite minerals in the subduction zone to paleointensity; (3) there is a high-resolution RPI from Lake Towuti which can be used as a reference curve in processing. Making PIS is done in 4 stages, that is selecting core data from western pacific, normalizing intensity values to equalize values, interpolating data to get the same age interval for all data, and PI stacking done with four weighting variations, the resulting model will be referred as WEPAPIS-60 (Western Pacific paleointensity stacking for the last 60 thousand last years). The results obtained can show the pattern of low-intensity values at 41 thousand years (Laschamp excursion), 34 thousand years (Mono Lake excursion), and the age range of 10-20 thousand years which may be related to a young series excursion.