NCSN Seismic Network Bulletin
January - December 1992
Table Of Contents

Table of Sections
Section	Title	Page
1.	Introduction	3
2.	Network Operations	3
2.	Earthquake Catalog	12
4.	Data Access and Archival	12
5.	Network Response	28
6.	Synopsis of Seismicity	30
7.	Cape Mendocino	30
8.	Shasta and Lassen	31
9.	Coast Ranges north of S.F. Bay	31
10.	The Geysers - Lower Clear Lake	31
11.	Central California Coast Range	31
12.	Loma Prieta - S. F. Peninsula	31
13.	San Francisco East Bay	31
14.	Creeping San Andreas	32
15.	Parkfield	32
16.	Western margin of the S. Central Valley	32
17.	Central Valley/Western Sierra Nevada	32
18.	Long Valley Caldera	32
19.	Central/Southern Sierra Nevada	32
20.	Carrizo Plain	32
21.	Bibliography	41
22.	Acknowledgments	42
23.	Appendix A. The UCB/USGS Seismology Data Center	43
24.	Sample session to the UCB/USGS Seismology Data Center	44
25.	Help files at the data center	45

List of Tables

Table Title Page

Table 1. Station Locations, Attenuations, Components,
and Magnitude Correction Factors 7
Table 2. Summary of Seismic Stations Reorded by the NCSN 11
Table 3. Network Changes in 1992 11
Table 4. Gradient P-Velocity Models 17
Table 5. Seismic Station Traveltime Corrections 19
Table 6. USGS Instrument Response Parameters 29
Table 7. M>3.5 Earthquakes Recorded during 1992 by the U.S.G.S. in Menlo Park 37

List of Tables
Table	Title	Page
Table 1.	Station Locations, Attenuations, Components, and Magnitude Correction Factors	7
Table 2.	Summary of Seismic Stations Reorded by the NCSN	11
Table 3.	Network Changes in 1992	11
Table 4.	Gradient P-Velocity Models	17
Table 5.	Seismic Station Traveltime Corrections	19
Table 6.	USGS Instrument Response Parameters	29
Table 7.	M>3.5 Earthquakes Recorded during 1992 by the U.S.G.S. in Menlo Park	37

List of Figures

Figure Title Page

Figure 1. Seismic stations recorded by the NCSN during 1992 4
Figure 2. Seismicity recorded by the NCSN during 1992 13
Figure 3. Boundaries of local velocity regions 14
Figure 4. Amplitude and phase response of NCSN 28
Figure 5. Boundaries of seismicity regions discussed in text 33
Figure 6. Seismicity of the Cape Mendocino earthquake sequence 34
Figure 7. Time-histograms of seismicity 35

Figure	Title	Page
Figure 1.	Seismic stations recorded by the NCSN during 1992	4
Figure 2.	Seismicity recorded by the NCSN during 1992	13
Figure 3.	Boundaries of local velocity regions	14
Figure 4.	Amplitude and phase response of NCSN	28
Figure 5.	Boundaries of seismicity regions discussed in text	33
Figure 6.	Seismicity of the Cape Mendocino earthquake sequence	34
Figure 7.	Time-histograms of seismicity	35

NCSN Seismic Network Bulletin January - December 1992 Table Of Contents

NCSN Seismic Network Bulletin
January - December 1992
Table Of Contents