1

APPENDIX B 

 This appendix contains monthly plots showing station usage per day for each 

station in each sub-network operated by AVO. Appendix B is 180 pages long. The 

presence of a dot indicates the station was used to locate at least 1 earthquake by the 

AVO on the indicated date. These plots provide a measure of both a station’s operational 

health, and earthquake frequency near a given volcano. It is noted that an absence of 

seismicity at a given network might imply either a station outage or a lack of seismicity. 

The contents are expressed by year and subnet. An absence of data for a given month 

implies that no earthquakes were measured at that sub-network during that period. Plots 

are organized by network going from east (Mount Spurr) to west (Kanaga). 
2

Station use at Spurr for January, February, March, 1994. 
3

Station use at Spurr for April, May, June, 1994. 
4

Station use at Spurr for July, August, September, 1994. 
5

Station use at Spurr for October, November, December 1994. 
6

Station use at Spurr for January, February, March, 1995. 
7

Station use at Spurr for April, May, June, 1995. 
8

Station use at Spurr for July, August, September, 1995. 
9

Station use at Spurr for October, November, December, 1995. 
10

Station use at Spurr for January, February, March, 1996. 
11

Station use at Spurr for April, May, June, 1996. 
12

Station use at Spurr for July, August, September, 1996. 
13

Station use at Spurr for October, November, December, 1996. 
14

Station use at Spurr for January, February, March, 1997. 
15

Station use at Spurr for April, May, June, 1997. 
16

Station use at Spurr for July, August, September, 1997. 
17

Station use at Spurr for October, November, December, 1997. 
18

Station use at Spurr for January, February, March, 1998. 
19

Station use at Spurr for April, May, June, 1998. 
20

Station use at Spurr for July, August, September, 1998. 
21

Station use at Spurr for October, November, December, 1998. 
22

Station use at Spurr for January, February, March, 1999. 
23

Station use at Spurr for April, May, June, 1999. 
24

Station use at Spurr for July, August, September, 1999. 
25

Station use at Spurr for October, November, December, 1999. 
26

Station use at Redoubt for January, February, March, 1994. 
27

Station use at Redoubt for April, May, June, 1994. 
28

Station use at Redoubt for July, August, September, 1994. 
29

Station use at Redoubt for October, November, December 1994. 
30

Station use at Redoubt for January, February, March, 1995. 
31

Station use at Redoubt for April, May, June, 1995. 
32

Station use at Redoubt for July, August, September, 1995. 
33

Station use at Redoubt for October, November, December, 1995. 
34

Station use at Redoubt for January, February, March, 1996. 
35

Station use at Redoubt for April, May, June, 1996. 
36

Station use at Redoubt for July, August, September, 1996. 
37

Station use at Redoubt for October, November, December, 1996. 
38

Station use at Redoubt for January, February, March, 1997. 
39

Station use at Redoubt for April, May, June, 1997. 
40

Station use at Redoubt for July, August, September, 1997. 
41

Station use at Redoubt for October, November, December, 1997. 
42

Station use at Redoubt for January, February, March, 1998. 
43

Station use at Redoubt for April, May June, 1998. 
44

Station use at Redoubt for July, August, September, 1998. 
45

Station use at Redoubt for October, November, December, 1998. 
46

Station use at Redoubt for January, February, March, 1999. 
47

Station use at Redoubt for April, May, June, 1999. 
48

Station use at Redoubt for July, August, September, 1999. 
49

Station use at Redoubt for October, November, December, 1999. 
50

Station use at Iliamna for February, March, September 1994. 
51

Station use at Iliamna for October, November, December, 1994. 
52

Station use at Iliamna for January, February, March, 1995. 
53

Station use at Iliamna for April, May, June, 1995. 
54

Station use at Iliamna for July, September, October, 1995. 
55

Station use at Iliamna for November, December, 1995. 
56

Station use at Iliamna for January, February, March, 1996. 
57

Station use at Iliamna for April, May, June, 1996. 
58

Station use at Iliamna for July, August, September, 1996. 
59

Station use at Iliamna for October, November, December, 1996. 
60

Station use at Iliamna for January, February, March, 1997. 
61

Station use at Iliamna for April, May, June, 1997. 
62

Station use at Iliamna for July, August, September, 1997. 
63

Station use at Iliamna for October, November, December, 1997. 
64

Station use at Iliamna for January, February, March, 1998. 
65

Station use at Iliamna for April, May, June, 1998. 
66

Station use at Iliamna for July, August, September, 1998. 
67

Station use at Iliamna for October, November, December, 1998. 
68

Stations used at Iliamna for January, February, March, 1999. 
69

Stations used at Iliamna for April, May, June, 1999. 
70

Stations used at Iliamna for July, August, September, 1999. 
71

Stations used at Iliamna for October, November, December, 1999. 
72

Station use at Augustine for February, March, April 1994. 
73

Station use at Augustine for May, June, July, 1994. 
74

Station use at Iliamna for August, September, October, 1994. 
75

Station use at Augustine for November, December, 1994. 
76

Station use at Augustine for January, February, March, 1995. 
77

Station use at Augustine for April, May, June, 1995. 
78

Station use at Augustine for July, August, September, 1995. 
79

Station use at Augustine for October, November, December, 1995. 
80

Station use at Augustine for January, February, March, 1996. 
81

Station use at Augustine for April, May, June, 1996. 
82

Station use at Augustine for July, August, September, 1996. 
83

Station use at Augustine for October, November, December, 1996. 
84

Station use at Augustine for January, February, March, 1997. 
85

Station use at Augustine for April, May, June, 1997. 
86

Station use at Augustine for July, August, September, 1997. 
87

Station use at Augustine for October, November, December, 1997. 
88

Station use at Augustine for January, February, March, 1998. 
89

Station use at Augustine for April, May, June, 1998. 
90

Station use at Augustine for July, August, September, 1998. 
91

Station use at Augustine for October, November, December, 1998. 
92

Station use at Augustine for January, February, March, 1999. 
93

Station use at Augustine for April, May, June, 1999. 
94

Station use at Augustine for July, August, September, 1999. 
95

Station use at Augustine for October, November, December, 1999. 
96

Station use at Katmai for July, August, September, 1995. 
97

Station use at Katmai for October, November, December, 1995. 
98

Station use at Katmai for January, February, March, 1996. 
99

Station use at Katmai for April, June, July, 1996. 
100

Station use at Katmai for August, September, October, 1996. 
101

Station use at Katmai for November, December, 1996. 
102

Station use at Katmai for January, February, March, 1997. 
103

Station use at Katmai for April, May, June, 1997. 
104

Station use at Katmai for July, August, September, 1997. 
105

Station use at Katmai for October, November, December, 1997. 
106

Station use at Katmai for January, February, March, 1998. 
107

Station use at Katmai for April, May, June, 1998. 
108

Station use at Katmai for July, August, September, 1998. 
109

Station use at Katmai for October, November, December, 1998. 
110

Station use at Katmai for January, February, March, 1999. 
111

Station use at Katmai for April, May, June, 1999. 
112

Station use at Katmai for July, August, September, 1999. 
113

Station use at Katmai for October, November, December, 1999. 
114

Station use at Aniakchak for August, October, December, 1997. 
115

Station use at Aniakchak for Feberuary, April, May, 1998. 
116

Station use at Aniakchak for June, October, 1998. 
117

Station use at Aniakchak for January, February, April, 1999. 
118

Station use at Aniakchak for August, September, October, 1999. 
119

Station use at Aniakchak for November, 1999. 
120

Station use at Pavof for July, August, September, 1996. 
121

Station use at Pavof for October, November, December, 1996. 
122

Station use at Pavlof for January, February, April, 1997. 
123

Station use at Pavlof for May, June, July, 1997. 
124

Station use at Pavlof for August, September, October, 1997. 
125

Station use at Pavlof for November, December, 1997. 
126

Station use at Pavlof for January, February, March, 1998. 
127

Station use at Pavlof for April, May, June, 1998. 
128

Station use at Pavlof for July, August, September, 1998. 
129

Station use at Pavlof for October, November, December, 1998. 
130

Station use at Pavlof for January, February, March, 1999. 
131

Station use at Pavlof for April, May, June, 1999. 
132

Station use at Pavlof for July, August, September, 1999. 
133

Station use at Pavlof for October, November, December, 1999. 
134

Station use at Shishaldin for August, September, October, 1997. 
135

Station use at Shishaldin November, December, 1997. 
136

Station use at Shishaldin for January, February, March, 1998. 
137

Station use at Shishaldin for April, May, June, 1998. 
138

Station use at Shishaldin for July, August, September, 1998. 
139

Station use at Shishaldin for October, November, December, 1998. 
140

Station use at Shishaldin for January, February, March, 1999. 
141

Station use at Shishaldin for April, May, June, 1999. 
142

Station use at Shishaldin for July, August, September, 1999. 
143

Station use at Shishaldin for October, November, December, 1999. 
144

Station use at Westdahl for December, 1998. 
145

Station use at Westdahl for January, February, March, 1999. 
146

Station use at Westdahl for April, May, June, 1999. 
147

Station use at Westdahl for July, August, September, 1999. 
148

Station use at Westdahl for October, November December, 1999. 
149

Station use at Akutan for March, April, May, 1996. 
150

Station use at Akutan for June, July, August, 1996. 
151

Station use at Akutan for September, October, November, 1996. 
152

Station use at Akutan for December, 1996. 
153

Station use at Akutan for January, February, March, 1997. 
154

Station use at Akutan for April, May, June, 1997. 
155

Station use at Akutan for July, August, September, 1997. 
156

Station use at Akutan for October, November, December, 1997. 
157

Station use at Akutan for January, February, March, 1998. 
158

Station use at Akutan for April, May, June, 1998. 
159

Station use at Akutan for July, August, September, 1998. 
160

Station use at Akutan for October, November, December, 1998. 
161

Station use at Akutan for January, March, April, 1999. 
162

Station use at Akutan for May, June, July, 1999. 
163
164

Station use at Akutan for August, September, October, 1999. 

Station use at Makushin for July, August, September, 1996. 
165

Station use at Makushin for October, November, December, 1996. 
166

Station use at Makushin for January, February, March, 1997. 
167

Station use at Makushin for April, May, June, 1997. 
168

Station use at Makushin for July, August, September, 1997. 
169

Station use at Makushin for October, November, December, 1997. 
170

Station use at Makushin for January, February, March, 1998. 
171

Station use at Makushin for April, May, June, 1998. 
172

Station use at Makushin for July, August, September, 1998. 
173

Station use at Makushin for October, November, December, 1998. 
174

Station use at Makushin for January, February, March, 1999. 
175

Station use at Makushin for April, May, June, 1999. 
176

Station use at Makushin for July, August, September, 1999. 
177

Station use at Makushin for October, November, 1999. 
178

Station use at Akutan for November, December, 1999. 
179

Station use at Great Sitkin for September, October, November, 1999. 
180

Station use at Great Sitkin for December, 1999.