A translation, rotation, and infrasound array for Seismology


Since Jan 2011, thanks to the instrument support from IES and TEC, we have successfully completed the siting and installation of six long‐term stations at the Nanao Park owned by the Forest Bureau and its neighboring area. This array is unique in several ways: (1) It is designed to monitor both translational and rotational ground motions, (2) It quipped three infrasound sensors since Jan. 2018, and (3) It was motivated to study earthquake swarms.
    Expected results:
  • Using array methods to study wavefield of earthquakes, infrasound and other events.
  • Detailed mapping of earthquake swarm activities to test the Kanamori 1972 hypothesis that earthquake swarms are related to the occurrence of great earthquakes


Status about Nanao Array

  • Jan. 2018: Installation of infrasound sensor
    Three infrasound sensors (M21, made by Chaparral Physics) are installed in NA03, NA07, and NA09. They all equipped with pipe array (1 meter in radius) as a wind filter to depress the influence of wind noise. Mr. Tsung-Chih Chi shown in the photo demonstrates how to assemble this pipe array. This infrasound array was the first ever installed in Taiwan. Collocated seismometer with infrasound, it provides great opportunity for understanding several geophysical questions such as: 1) ground-acoustic coupling, 2) source of infrasound in various frequency band, 3) earth sound during/before earthquake.


We have installed a 7‐element array. Right now we use a center station surrounded by a triangle 3‐node stations. The station spacing is about 500 m.


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