Crustal Thermal Structures Modeling Using Temperature-Depth Profiles in Northern Thailand

This study examines 1-D temperature-depth profiles (geotherms) in Northern Thailand by using computed compressional wave velocities (𝑣𝑝) derived from shear wave velocities (𝑣𝑠) models. These data, combined with various thermophysical parameters, are used to construct geotherms, focusing on thermal boundaries: the thermal brittle-ductile transition (thermal BDT), the thermal Curie point depth (thermal CPD), and the thermal uppermost mantle base (thermal lithospheric base). The study reveals relationships between geological boundaries, especially correlations between the depth of basin sediment-basement rock versus the thermal BDT and the upper-lower crust boundary versus the thermal CPD. The study also explores thermal BDT depth through crustal shear zone models based on frictional laws and quartzite flow assumptions. Additionally, assessing variability in crustal heat flow and strain rate informs understanding of crustal differential stress (𝜎3 – 𝜎1). Beyond geological insights, the study of geothermal energy evaluates hot-dry rock (HDR) potential. The study also correlates the crustal thermal gradient with the locations of regional hot springs.