GEOLOGICAL SURVEY National Center for Earthquake Research [PDF]

UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY National Center for Earthquake Research

CATALOG OF EARTHQUAKES ALONG THE SAN ANDREAS FAULT SYSTEM IN CENTRAL CALIFORNIA FOR THE YEAR

OPEN-FILE REPORT 78-1010

The report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards and nomenclature. Any use of trade names and trademarks in this publication is for descriptive purposes only and does not constitute endoresment by the U.S. Geological Survey. Menlo Park, California 1978

CATALOG OF EARTHQUAKES ALONG THE SAN ANDREAS FAULT SYSTEM IN CENTRAL CALIFORNIA, FOR THE YEAR 1974 by F. W. Lester and K. L. Meagher

CONTENTS Introduc tion........................................................ Instrumentation..................................................... Data Processing and Analysis........................................ Discussion of Catalog............................................... Acknowledgments..................................................... References..........................................................

Page 2 2 3 13 16 17

ILLUSTRATIONS

Figure 1

Block diagram of the NCER telemetered seismograph system........................ 2 System response of a typical NCER telemetered seismograph station.................. 3 Map showing principal seismograph stations used in locating earthquakes................. 4 Map showing earthquake epicenters reported in the Appendix.......................................

4 5 11 15

TABLES Table 1

Station data..............................................

6

APPENDIX Central California Earthquakes, 1974................................

19

INTRODUCTION

Numerous small earthquakes occur each day in the Coast Ranges of central California. The detailed study of these earthquakes provides a tool for gaining insight into the tectonic and physical processes responsible for the generation of damaging earthquakes. This catalog contains the fundamental parameters for earthquakes located within and adjacent to the seismograph network operated by the National Center for Earthquake Research (NCER), U.S. Geological Survey, for the year 1974. The motivation for these detailed studies has been described by Pakiser and others (1969) and by Eaton and others (1970). Similar catalogs of earthquakes for the years 1969, 1970, and 1971 have been prepared by Lee and others (1972b, c and d). Catalogs for the first, second, third, and fourth quarters of 1972 and the first, second, third, and fourth quarters of 1973 have been prepared by Wesson and others (1972a, b, 1973b, and 1974a and b), by Bufe and others U975J, and by Lester and others (1976a and b). The basic data contained in these catalogs provide a foundation for further studies. This catalog contains data on 3073 earthquakes in central California. Arrival times at 152 seismograph stations were used to locate the earthquakes listed in this catalog. Of these 136 were telemetered stations operated by NCER. Readings from the remaining 16 stations were obtained through the courtesy of the Seismographic Station, University of California, Berkeley (UCB), and the California Department of Water Resources, Sacramento. The Seismographic Station of the University of California, Berkeley, has for many years published a bulletin that both describes earthquakes in northern California and the surrounding area and lists readings at UCB stations from more distant events. The purpose of the present catalog is not to replace the UCB Bulletin, but rather to supplement it, by decribing the seismicity of a portion of central California in much greater detail. INSTRUMENTATION

The telemetered seismograph system used is illustrated by the block diagram in Figure 1. The equipment at each station includes a vertical component, 1 Hz seismometer (usually Mark Products, Model L-4C), a package containing a preamplifier and voltage-controlled oscillator (usually Develco, Model 6202), and batteries. The frequency-modulated tone produced at each station is carried by wire (occasionally by radio) to a terminal where it is combined with tones from up to 7 other stations The resulting multiplexed signal is then transmitted by voice-grade telephone circuits or radio to the NCER office in Menlo Park, California.

The eight channels of data on each line are separated and demodulated by discriminators (usually Develco, Model 6203), and recorded on 16 mm film using a Develocorder (Teledyne, Geotech, Model FR-400). Each Develocorder records seismic signals from up to 17 stations. In addition, 2 timing signals (WWVB on 2 traces, and a chronometer on 1 trace) are recorded simultaneously with the seismic signals. Figure 2 illustrates the overall response of the seismic system for a typical station. Magnification for individual stations is adjusted according to the background noise level in steps of 6 decibels. As a result, the response for an individual station may differ from that of the typical station by a factor of 2, 4, 8, or 16. Precise calibrations indicate that most stations are operated at magnifications of 25,000 to 100,000 at 1 Hz. All stations used in the present study are listed in Table 1. Station locations are plotted on Figure 3, except for 13 stations which are located outside the map boundaries. DATA PROCESSING AND ANALYSIS The telemetered seismic data recorded on 16 mm film were processed manually to yield information on first P-arrivals, directions of first motions, maximum amplitudes, and signal durations. These data were then processed by computer, using the HYP071 computer program (Lee and Lahr, 1972), to give origin time, hypocenter location, magnitude, and pattern of first motions of the earthquakes. Each roll of film contains about 24 hours recording and was processed in the following steps" (1) scanning, (2) timing, (3) preparing punched cards, (4) batch processing by computer program HYP071, (5) correcting errors, (6) adding data from other sources, (7) rerunning HYP071, (8) analyzing poor solutions, and (9) eliminating explosions. In March of 1973 an automatic real-time earthquake detection system was introduced. It resembles but was different in many respects to that described by Stewart and others (1971). During the period reported here, this new system was only experimental and was not used to replace the technique of manually scanning films to detect earthquakes. In the routine data processing, local events with signal duration of 10 seconds or more were always timed (see p. 12 for an explanation of signal duration). This corresponds to a cutoff at about magnitude 1 for events within the NCER network. Some smaller events for which 6 clear first arrivals could be obtained were also timed. The magnitude cutoff for events outside, but near the NCER network, was somewhat larger than 1. The catalog of earthquakes reported here contains all hypocenter solutions obtained, based on the above criteria. Because the station coverage was not uniform and because some events outside the network were reported, the cutoff for small magnitudes was not uniform over the entire area reported.

Cfl

I

Cfl «<

P>

Cfl

o.

0) cf 0) 1 (0

s

sr«-

0)

ft

CD M O

AMP

VCO

VHF XMTR

VHP RCVR

L JL J

TELEPHONE

TIME

WWVB

CIRCUIT

SEISMOMETER

DISCRIMINATORS

ini» i > ^ * A /» 11 ik

DEVELOCORDER

TIME CODE

CIRCUIT

AMP

VCO

TELEPHONE

GENERATOR

~ i i 11 ini|

i i 11 ini|

i i 11 MI_

i

i

10

g I05

o LL.

O <

10

10

I J i i mil 0.1

i i i mil

I 10 FREQUENCY

i i 11 n

100

Figure 2 System response of a typical NCER telemetered seismograph station. This magnification curve is obtained for a typical system (L-4C seismometer, Develco VCO/Amplifier, Develco Discriminator, and Geotech Develocorder) with electronic gains adjusted to produce a 10 mm peak-to-peak record amplitude when a 10 v rms, 5 Hz, calibration signal is introduced in place of the seismometer (attenution set at 42 db).

TABLE 1. STATION DATA OES TELEMETERED STATIONS CODE

LAT N

LONG W

DCE)

ELV

0(W>

ABP ACH ALM ALX AND AN6

37-56.35 37-58.57 37- 9,50 38-42.65 37- 9.77 37-51.68

122-45.53 121-45.62 121-50,82 122-45.30 121-37.45 122-25.77

140 74 244 379 244 223

2 1 1 1 1 1

(3.5) 7.0 1.6 0.8 3.0 2.2

ANZ ARN BBR BCR BEN B6H

36-53,08 37-20'.96 38-15.65 37- 9.62 36-30.60 37-20.52

121-35.45 121-3T.96 122-32.99 122- 1.57 121- 4.53 122-20.34

122 628 137 660 448 158

2 1 1 2 2 2

4p 4 3,9 2.2 3,7 3,4 3.8

BGM BOL BRO BRP BTW BVL

36-35.48 37-48.97 38- 0,48 38-40.07 36-18.90 36-34.51

121- 1.52 122- 3.72 120-24,92 122-11.60 120-55.75 121-11 .34

1216 610 387 867 381 510

1 1 1 1 2 2

3.0 4.6 (3,5) 3.9 2.1 3.1

BWR CAL CAN CAR CAS CBC

37-55.45 37-27.07 37- 1,52 38-19.28 35-55,90 36-55.88

122- 6.40 121-47,95 121-29.02 122-47.73 120-20.22 121-39163

221 265 332 98 1189 219

1 1 1 1 1 2

5.1 4.9 3.6 2.2 4.4

5.1 4.3 5.0. 2.2 5.2 3.2

CBO CCR CDR CHR CNR CNS

37- 6.71 37-47.30 38-22.19 36-57.46 36-42.55 37-56.33

121-41.33 121-57.00 122-27 ? 70 121r35'.01 121-20.60 120-31.76

192 185 620 241 305 373

1 1 1 1 2 1

2.2 7.1 2.2 2.1 4.8 (3.5)

2.7 7.1 2.2 3.6 0.7 (3.5)

COE COP CRN CRK CSH CYH

37-15,46 37-58^36 38- 1.12 37-14.50 37-38,88 37-33154 f 36-50.12 36-20.18 37-43,80 37-57,98 38- 1.78 37- 2.11

121-40,35 120-37.02 120-30.57 122- 7.82 122-02,57 122- V.62 _ T 121-38.64 120-22,58 121-50,12 122-15,17 122- 0,05 122- 6.25

366 336 475 607 170 38

1 1 1 2 1 1

5 9 (3^5) (3.5) 4.0 (3.5) 21 5

204 496 198 109 168 442

2 1 1 1 1 2

3.2 5.1 6.8 (3,5) 5.4

6,8 (3.5) (3.5) 4.4 4.0 3.2 ,. 2,2 4

f

PAICINES HOLLISTER AVENAL HONKFR BAY BICKMORE CANYON

SAN JUAN BAUTISTA BICKMORE CANYON SAN JUAN BAUTISTA BICKMORE CANYON TRES PINOS

TOPO VALLEY PAICINES TOPO VALLEY TOPO VALLEY MT HARLAN

QUADRANGLE

MARK WEST SPRINGS MARK WEST SPRINGS BICKMORE CANYON PARKFIELO LICK OBSERVATORY

TRES PINOS LA COSTA VALLEY CHITTENOEN WATSONVILLE EAST THREE SISTERS

8AN JUAN BAUTISTA TOP0 VALLEY PALO ESCRITO PEAK MINOFGO HILL KETTLEMAN CITY

GIL ROY LONOAK LA COSTA VALLEY OAKLAND EAST THREE SISTERS

EYLAR MTN PAICINES BICKMORE CANYON OIABLO WATSONVILLE EAST

SAN PENITO ^WATSONVILLE WEST QUIEN SABE VALLEY TOPO VALLEY ORTIGALITA PEAK

B B A B 3 1

C A B B A

B 3 B A 0

2 *° B 1.5 9

0^5 210 0.7 13 old

0^9 Oj'8 211 0.6 0.4

1.1 2.5

f\

0,6

2!o

0?6

O* 9

Oj4 1,2

03 0.2

0.4

1*4

0.9 0.6 016 2*6

1^5 1 jO 1.6 1:4 0.8

o!s 0*7

V 9 0*6 B

^l 3 2 5°

0.11 0, 16 0.12 0,14 0.10

Oj 7 B 0.4 A 0

0*8

o;i9 o!l2 0.15 0.22 0.10

B B B B

r.5 A

3J1 0,3 0*9 1,7

0,2 B 0.3 8 0'. 5 B

n!5 A

0^9 B

FRZ

0?8 0*5

»1»

09

0:6

S?4

0*. 5 n* 5

ERH

0.20 0.25 0.09

0.13 0*02

0.07 0.11 0*. 05 0.07 0. 16

(CONTINIIFD)

FEB

120-37.2 121-20.9 121- 4.2 121- 7". 5 121- 7.3

36-53". 7 36-43', 2 36-33.9 36-14.4 37-25*.0 36- 1,1 36-40.6 36-26,9 36-30.1 36-30.2

4 3'. 3 Ol5 23.3 21 '.3 17.3

55.7 3.7 18.2 10.0 48.9

7.2 54.1 44.4 16,8 11.2

7.8 13t9 23.1 31 .5 51.8

22 6 55 22 8 16 22 1 1 15 22 12 5 22 15 47

22 17 45 22 21 38 23 0 29 4 23 7 23 7 43

9 21 23 23 14 59 24 4 16 24 4 56 24 5 12

6 6 7 15 16

20 8 3 46 5 55 8 2 8 8

24 24 24 24 24

24 25 25 25 25

13 59 41 18 58

121-2510 121-21.3 121- 5.8 1 20-49.9 121-4412

37-11.8 36-43.2 37-23,1 37-23.1 37-53.7

52,9 24.1 11.6 8.9 36.9

58l9 33,7 33.4 2.4 28'.0

5'. 7 ?.6 7.0 6,3 4.9

120-35.3 121-22.0 121-46.7 1 21-42,8 1 22-48.8

36- T. 8 36-42.9 37-26. 1 37-22,2 3P-47.3

7.5

121-21 ,1 121- 4*. 3 121- 4.8 121-12.0 121- 4.0

36-43". 1 36-32.6 36-27,7 36-34.3 36-26.9

7.4 5.'0

14,5 11*8

V 1.6 5,5 5.1

121-35.7 1 21-49 ? 1 (1 2 1 - 4.1 121-17.7 121-36.2 5.6

V 3.3 516

1.6 4.9

6t6 16,8 5.9 5,8 3.8

6,7 6.7 7.6

V 3:0

V 8.6 4,2 5.3

6,4

V S 7 4.9 9.1

6,8

?, 7 9.4 3.1 9.3

11.3

31

DFPTH

1 1 17 1 2 9 1 0

1 r°

1 ? 1 ? 1

.4 .0 .5 .0 .6

1 .4 0 s, 6 0.4 1 .2 2.1

1 . 3 0.9 1 , 3 1.3 1.1

1 .4

1 .7 0.9 2.3 0".9

1.2 110 1 ,6 Ol8

0'.7

7 ?5 ?? 33 7

1 6 6 6 1 2 24

10 9 1 1 20 12

7 9 24 8 1 2

1 3 1 3 8 9 7

8 1 1 10 1 9 6

?.8 1.4 Ol 9 1 .7 0.5

21 1 1.1 0.8 1 .3

6 33 6 7 1 5

8 10 1 6 7 8

NO

0.6 2.8 0.4 1,6 2.1

o>

1 .7 1,3 1 .0 0.3

MAG

FARTHOUA,; MT SIZER LICK OBSgRVATORV

QUIEN SABE VALLEY PAICINES BICKMORE CANYON TOPO VALLEY TOPO VALLEY

TOPO VALLEY CHITTENDEN WATSONVILLE EAST BICKMORE CANYON BICKMORE CANYON

CALAVERAS RESERVOIR WUNPOST OAKLAND EAST PAICINES BICKMORE CANYON

SAN RENITO TOPO VALLEY MENDENHALL SPRINGS HOLLISTER LONOAK

QUADRANGLE

MAR

8*. 6 7', 8 55.0 29,8 55^.4

31.1 55.3 21.5 6.5 25.2

10 23 21 10 23 24 11 3 11 11 10 37 11 10 55

11 11 11 11 11

13 20 16 3 17 5 21 5 21 16

1 2 12 12 12 12

12 12 12 12 12

1 3 11 41 45 47

7 11 12 1 ? 12

12 12

16 8 47 56 1 5

16 17 2? 4 6

11 11 11

59*. 5 52,2 28.4 11.5 10*2

30,1 25.9 51 ,8 28.4 52.1

56.5 20.6 41.8 42.1 41.1

1 2.8 58.2 5.7

10 28 3 41 29

2 7*.6 7". 4

13 36 15 11 17 32 20 52 21 4

11 11 12 12 15

39,4 38 ? 8 5 7*. 9 28,2 32.8

10 5 22 10 9 6 9 26 10 10 12 27 10 13 28

10 10 10 10 10

21,3 43.5 1 1 .4 16.0 19.4

25 30 21 36 9

1 1 15 16 20 23

9 9 9 9 9

37-20.1 37- 0,4 37- 1.1 36- ?.1 36-35*. 2

37-39.1 36-54.8 37-28.2 37-19.5 37-19*.9

37-44. 3 37-26.0 36-37". 2 38-1 2,0 37- 7.6

36-?9.2 36-24.0 37- 5l5 36-52*9 35-44. 4

3 7- 17*. 3 35-26'. 3 36-49.4 36-24.0 36-29.3

35-59; 0 37- 8', 9 36-43.6 37- 2.3 36-48.6

36-3413 35-4418 37-39,8 36-34.3 35-5910

36-56.6 37-19 7 37-19.7 36-27. 2 36-26*.0

37-22.3 36-?8. 3 36-?8.5 36-38.4 36-36.4

50. 7 15.0 19.0 14.9 13.1

27 55 56 10 15

LAT N

SFC

16 1 8 1 8 19 10

MR MN

8 8 8 8 9

1974

8.? 5^6 6.6 5", 9 5.6 4,6 5*. 4 7,6 5.3 2.4

121- 41'.3 122- 13]3 122- 13.1 121- 4.5 121- 1 .8 121121122121120-

3.5 4.9 5.3 10.1 9.6

10.0 5.4 3.8 4. ? 1 3.9

122- 19.9 121- 16.1 121- 48.8 122- 15.0 122- 15.4 12?- 15.6 121- 42.0 121- 28.0 120- 39.3 121- 5*. 7

3.? 7.4 7,8 4,8 7.4

121- 6.1 121- 1.1 121-42,'4 121- 19^3 121- 14.0 10.4 4,4 8.9 5.3 5.2

4t6 7 &9 6.6 8.2 3.6

121- 38 '.8 120- 58.8 121- 33.8 121- 1.3 121- 6'.1

122- 33.7 121- 45,5 121- 15*.0 122- 10.2 121- 32.4

?,5 10.4 15.8 5.9 5.4

120-34 j4 121- 31,3 121- 21.1 121- 28,9 121-

1 6 ': 2

12.1 "l 1 2.7 12'.0 34U

6.9 4.7 4.2 4.4 1 4.4

34

DFPTH

121-42.^ 121-17.4 121-17.4 121- 17.3 121- 5.4

LOMC W

0> 0,9 1 . 1 2,4 0*. 6

0.8 0,7 0.9 3.2 0.6

1 .5 0,5 0.8 1 .3 0.9

7 . ?

0.9 1 .1 0.8 0.5

1.5 2,3 1 . 2

? .9

3:0

1 .4 1.3 1 .8

2,0

n,5-

?.o

1 .7 2.8 0 .9 2.0

1 .2

0.7 0",9

!, s o!a

?.1 0*.9

0.6

MAG

0

1 2 2 1 8

1 3 1 5 1 4 7

1 1 1 4

1 5 7 1 1 1 1 10

9 1 2 1 0 7 13

5? 10 20 25 9

10 9 1 8 18 25

16 26 12 21 10

1 7 8 6 1 3 7

8 ?0 30 40 7

77 59 76 133 85

165 189 83 71 73

118 105 59 76 111

106 99 78 131 ?56

84 220 81 64 105

143 134 62 55 50

66 ?34 83 55 143

78 60 136 106 118

36 111

86 34

NO GAP

M 1.8 10.il 6*. 3

*\*

4.9 2,4 5." ?. 5."3

ini8

1 3.6 Al1 2ffi° 9,8 8.5

38.6

2,8 10*2 1*2

3i 4

2j'8 3*3

S ?Jo

4*1

1.4 5."8

$ 2.1

M 1.1 9^8

1.1 37l 7

6,0 1.4

V

V

1( 3

6.1

3!l 3* 3

4.7

D *l I N RMS

0.06 0.10 0. 12 0.25 0.04

0.10 0* 15 0,18 0.17 0.05

0. 19 0,15 O',08 0.19 0.08

0.13 O.*11 0.09 0.05 0.10

0".12 0.13 0. 13

0',22 0*15

0,13 0*f 04 0.14 0,13 0^12

0,08 0.?5 0^11 0.09 0.11

0.10 0.06 0.03 0.10 0.07

0.12 0^15 0. 18 0.19 0'. 04

CENTRAL CALIFORNIA FARTHQUA* F S--197 A (CONTINUED)

0^6

1*9

O'. 5

oU

Op8 1.1 0.9 0.5 0*^4

OS' 1 *3 0?5

0.9

B

D

C

B

1.7

A

19 l^V r {.

OjS A 1,3 A Ol6 A

0,9 B 0^5 3 1 ^3 A

°i 6 B 2:1 c

1.8 B 0.5 B

0:7 A

0.7 B

i; s B

1.1

IjB

?.o

111

Of 6

B 0*6

9

K1

B 0 A A B

C 8 A A B

U * v5

ft

0.4 1.4 0*9 0,9 2*7

°| 6 Oj7 1.0 019 0*6

1;3 B Oj4 A 0.5 B

0:9 c

A A 3 B 3

0'J6 A

Ol7 0:9 0^6 113 0.9

o!s B 015 B 0.4 B

2*2'B

ERZ Q

ols

Oj8 0 .6

0.8

3^7 0 ,5 o!*4

0*5

o;4

°3 5

10 0^3 0.6

o!9

n.s

1 .*8

0*3

0, 5 0.6

"I* 0,4 0*3

0*6

0^4 0.5 0'4

FRH

-

LA HONDA MT MADONNA GILROY HOT SPRINGS SLACK CANYON SAN BENITO

HUNTERS POINT THRFF SISTERS CALAVERAS RESERVOIR LA HONDA LA HONDA

***6ULF OF THE FARALLONES*** CALAVERAS RESERVOIR BICKMORE CANYON CORDELIA 7 MT SIZER

TOPO VALLEY TOPO VALLEY MT MADONNA THREE SISTERS SAN SIMFON

LICK OBSERVATORY CAYUCOS SAN JUAN BAUTISTA TOPO VALLEY TOPO VALLEY

STOCKOALE MTN i MT SI2ER PAICINES GILROY HOT SPRIN6S TRgS PINOS

6ICKMORE CANYON SAN SIMEON HAYWARD 8ICKMORE CANYON STOCKOALE MTN

WATSONVIILE EAST MINDFGO HILL MINDFGO HILL TOPO VALLEY TOPO VALLEY

LICK OBSFRVATORY PAICINES PAICINES PAICINES SAN BENITO

QUADRANGLE

MAR

N

37 ~

45*7 47*0

37- 1.3 38- 3.7 36-34.2 36-56.9 37- 1.1

44.9 14.1 54,8 4913 20.9

4 6 12 14 16

20 0 5 5 5

6 8 8 8 9

15 20 20 20 22

22 1 4 4 5

16 16 16 16 16

16 17 17 17 17

17 17 17 17 17

17 17 17 17 17

17 18 18 18 18

25 35 1 1 37 49

8 4 16 19 9

21 4 26 43 56

41 29 16 23 46

3 39 29 22 24

37- 5.7 36-43. 1 36-56.3 36-331 4 36-43. 1

36-33 !. 8 36-55.1 36-55. 2 36-55.2 36-34*.9

46l6 29.3 21.5 23.7 5 3". 8

27.2 16.9 21.7 2R . R 4.3

37- 0,8 36-14.2 36-28.7 37-33. 5 37- 1.8

37-19, 3 36-33.2 37- 1.0 36-52,1 36-3416

V 17,7 29,9 23.1 57.8

56.4 36l4 12.9 10.8 28.7

37-27.1 36-59.8 37-44.7 37-44^4 37-5115

28',4 21 !s 13lO 21 2 22.6

7 1 4 8 38 42

19 21 1 1 12

36-36.4 36-46.0 36-3?, 2

36-33j9

1 4 14 15 15 15

38 S

36-3R.9 37- 7'3 36-59.5 36-29:? 36-38.6

2.0 58'.1 51',7 5'. 6 48l9

37-22.5 36- 2.2 36-34.4 36-57.0 37-32.0

LAT

5 6', 4 30.5 26.0

5 38 16 1 14

15.3 2.5 49,9 3 '.9 42.0

SEC

7 39 8 57 1 1 19 12 52 1 3 54

1 2 5 7 7

14 14 1 4 14 14

26 57 21 51 3

MN

W

121-30.0 121-24.3 121-26.0 121-10.9 122- 2.8

121- 5*. 5 121-29.0 121-28.4 1 21-28.5 1 2 1 - 1 5 '. 1

121-42.8 120-48.8 120-39.1 121-40.6 121- 6.8

1 21-39.9 1 2 1 - 1 0 .' 9 121-42:9 121-35.6 121- 8.5

121- 7.1 121-54.2 121-12.0 121-19.4 121-43.7

121-49.4 121-27. p 121-48.6 121-48,5 122- 0.4

,lil-30 1 '111^11^6 120-52:2 111 -25. 7 1J 1 "* 9 ' 8

121-18.8 121-33.8 121-38.6 121- 6.4 121-15.0

121-43.0 120-3818 121-12.0 121-35".2 121-51.3

LONG

CALIFORNIA

14 14 14 14 14

23 2 4 8 20

HR

1 2 13 13 13 13

1 974

CENTRAL

1 .7 0,7 1 .7 1 .3 1 .9

9,0 5.9 14^4 6,3 7.6

R.6 7.4 1 .7 4.1 6.Q

4.? 5t9

4.n

0.6 2.5 1.2 0.4 1.2

5.0 3.4 9^3 4,5 8.7

1 .8 1 .7 0.8 1 .4

o.s

1 .R

1 .1

o.s

0.4

n.7

O.P 1 .3 0.8 1 .0 3.0

8.4 17.3 4.8 5.2 9.7

13.4 5.6

0.8 O'. 8

1,2

n!? n.9

0.9 2.2

n'. R o.s

0.2

1 .4 0.7

n', 4

1 .3 0,5

0.7 2.4 2.2 1". 3 0.4

MAG

3^9 3.* 4 10,2 9j R 6.6

A, 8 5t 9 2.9 10 .* 7 7l4

8.1 5,6 6.1 3.5 8.1

9.1 5l2 S 1 5.7 1 2.4

DEPTH

6 21 1 7 7 1 4

7 6 1 1 9 24

30 9 9 1 1 37

9 30 23 7 1 7

1 7 1 9 1 4 1 4 54

1 3 6 10 9 1 1

7 1 4 7 17 ?6

16 8 8 1 7 1 2

R 1 3 26 24 7

MO

EARTHOUAKFS--1974

17? 54 73 1 ?R 213

104 «3 80 80 51

48 145 176 111 71

71 44 47 114 62

47 R6 75 90 43

74 143 132 133 190

92 78 141 44 4-<

42 139 115 68 62

84 135 55 40 «1

GAP

1 7? 5

?? 2

4.7 5*7

5*7 V

?I 2 3T1

6*1

1T9

18I9 _ t-

!»S

V 4:3

3,9

0.03 0.14 0,10 0,01 0.12

0*,03 0^05 0.06 0.07 0.10

0.10 0,16 0.21 0,18 0.16

0^2 0.11

0^08 0.14 0*12

2i5 7^1

7*3

9^3

4?2

0', 16 0.06 0,06 0,03 0.07

0.05 0.03 0.06 0.13 0.10

olio

0.09 0.03 0,02 0.14

0.07 0,'23 0,11 0.08 0.15

RMS

0112 0.24 0.06 0,13 0.15

2:'0

2»2 3?7 2.7 2,6 6*7

4.9

5*7

V

4*0

3*2

7