Miyo

There is a good coherence signal around microseismic band on the 3 seismometer which is located Xend, Yend, Center Area.

• I measured coherence of the seismometer signal between Xend and Yend, and between Xend and Center.
• Although Xend seismometer is amplifired 30db using whitenig filter (S1605077,left boad), Yend and Center are not amplifired before AA circuit.
• Channel name of Xend is K1:PEM-EX1_SEIS_XX_SENSINF_OUT_DQ, Yend is K1:PEM-EY1_SEIS_XX_SENSINF_OUT_DQ, Center is K1:PEM-IY0_SEIS_XX_SENSINF_OUT_DQ, where XX is dof such as NS,WE,Z.
• OUT_DQ channels's unit are converted to velocity using c2V,V2vel filter. c2V = 0.00061035 = 10/2**15, V2vel = 0.00083160 =1/1202.5 acording to Trillium120QA data sheet.
• Coherence would suggest that global seismic wave accross the KAGRA mine. 

Next, I'm going to check the phase of the coherence to know where this global wave come from, and also to compare the strainmeter of GIF to know  how this wave move.