Depth of Recorded Events Over Tim e Located Using Local Network - - PowerPoint PPT Presentation

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Sep 04, 2022 136 likes •211 views

Depth of Recorded Events Over Tim e Located Using Local Network 11/1/2013 1/30/2014 4/30/2014 7/29/2014 10/27/2014 1/25/2015 4/25/2015 0 -5,000 Lower Barnett Ellenberger -10,000 Basement M>=3.0 2.5<=M<3.0 Depth [ft]

SLIDE 1

Depth of Recorded Events Over Tim e

Located Using Local Network

30,000
25,000
20,000
15,000
10,000
5,000

11/1/2013 1/30/2014 4/30/2014 7/29/2014 10/27/2014 1/25/2015 4/25/2015

Depth [ft]

M>=3.0 2.5<=M<3.0 2.0<=M<2.5 1.5<=M<2.0 1.0<=M<1.5 Ellenberger Basement Lower Barnett

SLIDE 2

Seism ic Station Distribution

The local network provides accurate locations, but the WMOK station recorded the full earthquake sequence.

SLIDE 3

Deep Event Located with Local Network 12/22/2013 – M3.1 21,700 ft depth Event Not Located No Local Network 12/08/2013 – M3.6 Shallow Event Located with Local Network 1/28/2014 – M2.4 12,100 ft depth

Shear W aveform Com parison

Shallow vs Deep Events

SLIDE 4

Deep Event Located with Local Network 12/22/2013 – M3.1 21,700 ft depth Event Not Located No Local Network 12/08/2013 – M3.6 Shallow Event Located with Local Network 1/28/2014 – M2.4 12,100 ft depth

Shear W aveform Com parison

Shallow vs Deep Events

Xcor coeff. = 0.61 Xcor coeff. = 0.34

Events that occurred prior to the local network installation are highly correlated with later, accurately located events deep in the basement.

SLIDE 5

Cross Correlation Detection Colored by Depth

SLIDE 6

Mom ent Release vs. Depth

0.00000E+00 5.00000E+14 1.00000E+15 1.50000E+15 Q4_2013 Q1_2014 Q2_2014 Q3_2014 Q4_2014 Q1_2015 Q2_2015

10,000 12,500 15,000 17,500 20,000 22,500 25,000

Moment (Nm) Depth (ft)

Basement 10,200 ft