Reexamination of the Neogene Paleostress Field Using Fault‐Slip Data From Jogashima, Miura Peninsula, Central Japan

ABSTRACT The Neogene Misaki Formation, which occurs on the southwestern part of Jogashima Island at the southern tip of Miura Peninsula, Japan, is cut by numerous minor faults. Using fault‐slip data, we reconstructed the paleostress field by stress inversion analysis. Two significant stresses, A and B, were detected. Stress A is an E–W tensional (normal‐faulting) stress that is close to axial compression, and Stress B is an E–W compressional (reverse‐faulting) stress that is close to axial extension. These stresses occurred after the formation of large‐scale geological structures, such as the Kenzaki Anticline and Jogashima Syncline. In addition, the dip‐slip faults are cut by a large dextral fault that is subvertical and strikes WNW–ESE. Therefore, this dextral fault has been active in a stress field similar to that of the present day (i.e., σ 1 ‐axis oriented NNW–SSE and σ 3 ‐axis oriented ENE–WSW). (143 words).