Daily rhythmic north-south & east-west ground motion in US, the Wobble Effect

[Kojima]

EarthScope ANF Website 

http://anf.ucsd.edu/stations.php

gives the latest seismic data from a server of each station in the USArray as a detail of waveforms, plot for Last Month, Last Week, Last Day or Last Hour.

A plot of the seismic waveforms shows three data channels:

Long-Period channels LHZ, LHN, and LHE.

http://quake.geo.berkeley.edu/bdsn/make_seismogram_help.html

Each of the bands has three components, Z for vertical motion, E for east-west motion, and N for north-south motion.

Some stations in the USArray show a daily rhythmic motion for two channels of LHN and LHE, which means that a daily earth wobble

Earth Wobble Mechanics

lets a bowing of the North American Plate progress steadily.

I show examples of the seismic waveforms for six stations showing daily rhythmic north-south and east-west motion.

1) TA.N02D: Trinity Center, CA, USA; 40.97 N, 122.71 W

2) US.MVCO: Mesa Verde, Colorado, USA; 37.21 N, 108.50 W

3) US.MNTX: Cornudas Mountains, Texas, USA; 31.70 N, 105.38 W

4) IU.DWPF: Disney Wilderness Preserve, Florida, USA; 28.11 N, 81.43 W

5) TA.Y56A: Pelion, SC, USA; 33.79 N, 81.30 W

6) TA.G59A: Clarenceville, QC, USA; 45.08 N, 73.18 W

There are other stations showing such daily rhythmic waveforms as well as six stations above.

[Station showing daily rhythmic waveforms]

TA.M02C: Callahan, CA, USA; 41.39 N, 122.85 W

TA.O02D: Mt. Diablo Meridian, CA, USA; 40.18 N, 122.79 W

TA.D04E: Lakebay, WA, USA; 47.18 N, 122.77 W

TA.O03E: Paynes Creek, CA, USA; 40.29 N, 121.80 W

CI.MPP: Mcpherson Peak, Los Olivos, CA, USA; 34.89 N, 119.81 W

CI.CWC: Cottonwood Creek, Lone Pine, CA, USA; 36.44 N, 118.08 W

CI.MUR: Murrieta, Murrieta, CA, USA; 33.60 N, 117.20 W

CI.IKP: In-Ko-Pah, Jacumba, CA, USA; 32.65 N, 116.11 W

TA.Y12C: Blythe, CA, USA; 33.75 N, 114.52 W

US.SDCO: Great Sand Dunes National Park, Colorado, USA; 37.75 N, 105.50 W

TA.Q24A: Divide, CO, USA; 38.96 N, 105.15 W

IU.WVT: Waverly, Tennessee, USA; 36.13 N, 87.83 W

US.AAM: Ann Arbor, Michigan, USA; 42.30 N, 83.66 W

TA.X54A: Belton, SC, USA; 34.55 N, 82.37 W

TA.X58A: Rowland, NC, USA; 34.55 N, 79.34 W

TA.X60A: Albert Glenn Thornton, NC, USA; 34.58 N, 77.98 W

TA.H66A: Whiting, ME, USA; 44.79 N, 67.31 W

[Examples]

1) TA.N02D: Trinity Center, CA, USA; 40.97 N, 122.71 W

2) US.MVCO: Mesa Verde, Colorado, USA; 37.21 N, 108.50 W

3) US.MNTX: Cornudas Mountains, Texas, USA; 31.70 N, 105.38 W

4) IU.DWPF: Disney Wilderness Preserve, Florida, USA; 28.11 N, 81.43 W

5) TA.Y56A: Pelion, SC, USA; 33.79 N, 81.30 W

6) TA.G59A: Clarenceville, QC, USA; 45.08 N, 73.18 W