12-006 Fracture Decouple Experiment Anastasia Stroujkova Weston Geophysical Corp. Well-known hypothetical nuclear explosion evasion scenarios include cavity decoupling and placing nuclear tests within routine ripple-fired mine explosions. We consider a different scenario: using “repeat shots” - explosions conducted in the damage (fracture) zone created by an earlier explosion(s), which may considerably reduce the amplitudes of the subsequent explosions due to a fracture decoupling. We conducted a unique experiment to quantify the effects of fractures on chemical explosion decoupling. We conducted a series of explosions (shots) in order to extensively fracture granitic emplacement media. Seismic signals from the explosions were recorded on temporary near-source and local stations as well as permanent stations. We then re-drilled the same blast holes and reloaded the holes for a second series of equivalent yield shots. *** Please check the following lines and remove this line before submission to DMC. *** Shots shot id time lat lon elev (m) size (kg) depth (m) ------------------------------------------------------------------------------------- 1 2011:292:18:35:16.628 43.687290 -71.851720 396.000 232.000 12.000 2 2011:299:20:53:35.220 43.687180 -71.851310 391.000 31.000 14.000 3 2011:299:21:13:44.656 43.687350 -71.851620 393.000 31.000 14.000 Arrays *** Please check the following lines and remove this line before submission to DMC. *** Array: 001 Sample Rate: 500 sps Deployment Time: 2011:292:00:00 Pickup Time: 2011:299:23:59 Components: 1 => Z, 2 => N, 3 => E station das lat lon elev (m) component ----------------------------------------------------------------- 10001 91E7 43.680410 -71.857480 492.000 1 10001 91E7 43.680410 -71.857480 492.000 2 10001 91E7 43.680410 -71.857480 492.000 3 10002 9240 43.685660 -71.842120 334.000 1 10002 9240 43.685660 -71.842120 334.000 2 10002 9240 43.685660 -71.842120 334.000 3 10003 9256 43.693650 -71.846530 398.000 1 10003 9256 43.693650 -71.846530 398.000 2 10003 9256 43.693650 -71.846530 398.000 3 10004 9578 43.683230 -71.856730 445.000 1 10004 9578 43.683230 -71.856730 445.000 2 10004 9578 43.683230 -71.856730 445.000 3 10005 9772 43.686050 -71.844250 348.000 1 10005 9772 43.686050 -71.844250 348.000 2 10005 9772 43.686050 -71.844250 348.000 3 10006 9791 43.691510 -71.847380 399.000 1 10006 9791 43.691510 -71.847380 399.000 2 10006 9791 43.691510 -71.847380 399.000 3 10007 9793 43.694930 -71.856990 378.000 1 10007 9793 43.694930 -71.856990 378.000 2 10007 9793 43.694930 -71.856990 378.000 3 10008 9875 43.699000 -71.858030 348.000 1 10008 9875 43.699000 -71.858030 348.000 2 10008 9875 43.699000 -71.858030 348.000 3 10009 92AD 43.686880 -71.858970 435.000 1 10009 92AD 43.686880 -71.858970 435.000 2 10009 92AD 43.686880 -71.858970 435.000 3 10010 92C0 43.687840 -71.836610 356.000 1 10010 92C0 43.687840 -71.836610 356.000 2 10010 92C0 43.687840 -71.836610 356.000 3 10011 944A 43.686310 -71.839330 361.000 1 10011 944A 43.686310 -71.839330 361.000 2 10011 944A 43.686310 -71.839330 361.000 3 10012 953C 43.687390 -71.866230 430.000 1 10012 953C 43.687390 -71.866230 430.000 2 10012 953C 43.687390 -71.866230 430.000 3 10013 980E 43.686310 -71.860950 427.000 1 10013 980E 43.686310 -71.860950 427.000 2 10013 980E 43.686310 -71.860950 427.000 3 10014 981B 43.686390 -71.864080 451.000 1 10014 981B 43.686390 -71.864080 451.000 2 10014 981B 43.686390 -71.864080 451.000 3 10015 985D 43.694740 -71.844790 397.000 1 10015 985D 43.694740 -71.844790 397.000 2 10015 985D 43.694740 -71.844790 397.000 3 10016 990B 43.697360 -71.857120 366.000 1 10016 990B 43.697360 -71.857120 366.000 2 10016 990B 43.697360 -71.857120 366.000 3