Underwater acoustic records from underwater controlled sources and earthquakes on the Japan Trench seismic network

Low frequency hydro-acoustic waves can be detected at great distances due to low attenuation of acoustic energy in the SOund Fixing And Ranging (SOFAR) channel. The hydro-acoustic waves are also a part of T phase propagation. Since attenuation of T phases in land are high, and many sea bottom data are available in some regions lately, we examined hydro-acoustic waves from underwater controlled sources and earthquakes at sea bottom seismic network of the Japan Trench zone. In this presentation, we will show the signal characteristics and their variation depending on the sources and receivers.