THANKS

Craig Pearson an d Rod Whitaker (LANL ), Jessie Bonner (Weston Geophys ics),Terry Wallace (UofArizona),

Diane Doser (UT El Paso), Phelps -Dodge Morenci and Tyrone, Paul Loeffler (Texas General Land Office).

ANMO

KNB

TXAR

NVARSRU

TPNV

TUC

WMOK

WUAZ

120W 110W 100W

30N

40N

LANL

ST. GEORGE

WESTERN US SE ISMO-ACOUSTIC NETWORK

Existing Seismo-Acoustic Array

Existing In-Mine Seismo-Acoustic Instruments

Existing Infrasound Array

Infrasound Mini Array Upgrade to Existing Seismic Station

Existing Seismic Station

Morenci

Tyrone

TXARTXARFORT HANCOCKFORT HANCOCK

Fort Hancock

NVARNVAR

TYRONE

MORENCI

P

NA

P

00.5 2.0

P

01.0 4.0

P

02.0 8.0

P

04.0 16.0

P

08.0 32.0P

016.0 64.0P

032.0 -1.0

P

054.0 -1.0

21:36:50

EVENT 1 SEISMIC FREQUENCY CONTENT

Time (hr :min:sec)

EVENT 1 ACOUSTIC FREQUENCY CONTENTP

NA

P

00.5 2.0

P

01.0 4.0

P

02.0 8.0

P

04.0 16.0

P

08.0 32.0

P

016.0 64.0

P

032.0 -1.0

P

064.0 -1.0

21:36:50 :55

Time (hr :min:sec)

SEISMIC IN-MINE & REG IONALSEISMIC IN-MINE & REG IONAL

DATA W ITH GROUND TRUTHDATA W ITH G ROUND TRUTH

ACOUSTIC IN-MINE ACOUSTIC IN-MINE

DATA W ITH GROUND TRUTHDATA W ITH G ROUND TRUTH

MULTIPLE E XPLOSIVE PATTERNS DETONATED O VER SHORT

TIME INTERVALS AS CHARACTER IZED B Y GROUND TRUTH

AND IN-MINE OBSE RVATIONS

P

-7000000

0

7000000

swmore/BHZ

P

-7000000

0

7000000

swmore/BHN

P

-7000000

0

7000000

swmore/BHE

P

-500000

50000swmore/SD1

P

-500000

50000swmore/SD2

P

-500000

50000swmore/SD3

21:36:45 :55

1

2

3

4

5

6

Event01

Time (hr:min:sec)

a 2.04

21:36:49.30

Morenci

IN-MINE SE ISMICIN-MINE SE ISMIC

& ACOUST IC& ACOUST IC

Pg

PgPn Lg

ANMO337.1 Pg

PgPn Lg

KNB536.1

PgPn Lg

LTX685.1

PgPn Lg

MNV989.4

Pg

PgPn Lg-100

0

100SRU674.2

Pg

PgPn Lg

TPNV755.6

Pg

PgPn Lg

TUC159.8

PgPn Lg

WMOK994.6

Pg

PgPn Lg

WUAZ324.9

P

Lg-3000000

0

3000000swmore0.0

19:11:00 :12:00 :13:00 :14:00 :15:00 :16:00

1

2

3

4

5

6

7

8

9

10

Time (hr :min:sec)

GROUND TRUTHGROUND TRUTH

STUDY GOALS

* Esta blish regional seis mo-acoustic

net work.

* De velop in- mine seis mic and

acoustic instru mentation.

* Construct ground truth data base of hard rock blasts.

* Quantify coupling an d source

characterization (seis mic &

infrasound).

* Quantify seis mic and infrasound

propagation pa th effects.

RESULTS

* Hard rock mines detonate multiple patterns o ver short ti me periods ( 0-60 s) resulting in co mplex regional sig nals.

* So me hard rock explosions are detonated with no delays.

* Close-in and region al seis mic a mplitudes do not scale with total a mount of explosi ves.

* Close-in acoustic a mplitudes do appear to scale with explosi ve

size.

THANKSTHANKS

Craig Pearson an d Rod Whitaker (LANL ), Jessie Bonner (Weston Geophys ical), Terry Wallace (U of Arizona), Craig Pearson and Rod Whitaker (LANL ), Jessie Bonner (Weston Geophys ical), Terry Wallace (U of Arizona),

Diane Doser (UT El Paso), Phelps -Dodge Morenci and Tyrone, Paul Loeffler (Texas General Land Office).Diane Doser (U T El Paso), Phelps -Dodge Morenci and Tyrone, Paul Loeffler (Texas General Land Office).

REGIONAL OBSER VATIONSREGIONAL OBSER VATIONS

bz

bn

be

sd1

sd2

sd3

TX01/sz

TX02/sz

TX03/sz

TX04/sz

TX06/sz

TX07/sz

TX08/sz

TX09/sz

TX10/sz

22:10:00 :12:00 :14:00

Time (hr:min:sec)

MULTIPLE FRAGMENTATION SHOTS RECORDED AT MORENCI AND TXAR

MO

RE

NC

I DA

TA

MO

RE

NC

I DA

TA

TX

AR

DA

TA

TX

AR

DA

TA

IN-M

INE

IN

-MIN

E

SE

ISM

ICS

EIS

MIC

IN-M

INE

IN-M

INE

AC

OU

ST

ICA

CO

US

TIC

TUC SEISMIC AMPLITUDES

IN-MINE ACOUSTIC AMPLITUDES

IN-MINE ACOUSTIC PERIOD

Charge Wt (lb)

Charge Wt (lb)

Charge Wt (lb)

Blast Duration (s)

Pea

k V

eloc

ity (

mm

/s)

Pea

k V

eloc

ity (

nm/s

)

Aco

ustic

Per

iod

(s)

bz

bn

be

sd1

sd2

sd3

21:44:45 :50 :55 :45:00Time (hr:min:sec)

TWO FRAGMENTATION PATTERNS DETONATED SIMULTANEOUSLY

IN-M

INE

IN-M

INE

SE

ISM

ICS

EIS

MIC

IN-M

INE

IN-M

INE

AC

OU

ST

ICA

CO

US

TIC

Pattern 1

Pattern 2

100000010000010000

1000

100

10000

200000 400000 6000000

Aco

ustic

Pea

k (P

a)

200

100

0

0 1 2

1.2

1.6

0

0.4

0.8

0 200000 400000 6000000

4

8

12

16

SEISMIC

ACOUSTIC

Hz

Hz

Hz

Hz

Hz

Hz

Hz

Hz

Broadband STS-2

Hz

Hz

Hz

Hz

Hz

Hz

Hz

Hz

20 HzWideband

PgLgRg

IN-MINE SEISMIC AMPLITUDES

Pattern 1 Pattern 2

66 s0.6 s