TY - JOUR
T1 - Tidal Response in Shallow Tectonic Tremors
AU - Katakami, S.
AU - Yamashita, Y.
AU - Yakihara, H.
AU - Shimizu, H.
AU - Ito, Y.
AU - Ohta, K.
N1 - Funding Information:
This study was supported by the Japan Society for the Promotion of Science grant KAKENHI-26257206 to Y. I. and KAKENHI-15K17745 to Y. Y. GMT software (Wessel et al., 2013) was used to draw the figures. The authors declare that they have no competing interests. The seismicity data of the regional and local earthquakes used in this work were obtained from the Japan Meteorological Agency (JMA). Ocean bottom seismometer data are available from Y. Yamashita who is one of the coauthors, (Yamashita et al., 2015). The work observed using OBS data was supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan under its Observation and Research Program for Prediction of Earthquakes and Volcanic Eruptions. We thank Andrew V. Newman, Mike Brudzinski, and an anonymous reviewer for their comments.
Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.
PY - 2017/10/16
Y1 - 2017/10/16
N2 - Various types of slow earthquakes (e.g., tectonic tremors and slow slip events) have been reported in tectonic zones, especially in the subduction zone. The tidal response of a tremor is considered to be strongly related to the weak friction state of the plate interface, and many studies have reported observational evidence of such correlation between tides and deep tremor activity. Here we used the modified frequency scanning method at a single station to detect micro tectonic tremors that have not been previously reported in southern Kyushu. In the early stage of the tremor activity, tremors are mostly modulated by slow slip events. In contrast, we found a seismic response to ocean tides during the later stage in the shallower part of the subduction zone. This might indicate that the tremors are triggered by tidal changes caused by fault weakening due to slow slip events as same as deeper condition.
AB - Various types of slow earthquakes (e.g., tectonic tremors and slow slip events) have been reported in tectonic zones, especially in the subduction zone. The tidal response of a tremor is considered to be strongly related to the weak friction state of the plate interface, and many studies have reported observational evidence of such correlation between tides and deep tremor activity. Here we used the modified frequency scanning method at a single station to detect micro tectonic tremors that have not been previously reported in southern Kyushu. In the early stage of the tremor activity, tremors are mostly modulated by slow slip events. In contrast, we found a seismic response to ocean tides during the later stage in the shallower part of the subduction zone. This might indicate that the tremors are triggered by tidal changes caused by fault weakening due to slow slip events as same as deeper condition.
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U2 - 10.1002/2017GL074060
DO - 10.1002/2017GL074060
M3 - Article
AN - SCOPUS:85031317985
VL - 44
SP - 9699
EP - 9706
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 19
ER -