Electronic Supplement to
Upgrade of the New China Digital Seismograph Network

by D. Anderson, J. Anderson, D. Ford, L. S. Gee, G. Gyure, C. R. Hutt, E. Kromer, L. Li, B. Marshall, K. Persefield, A. T. Ringler, M. Sharratt, T. Storm, D. Wilson, D. Yang, and Z. Zheng

Table S2. History of Instrumentation at CDSN/NCDSN Sites

Station Code	Network Code	Time Period* (yyyy/mm/dd)	Primary Broadband Sensor Model	Secondary Sensor Model†	Accelerometer Model	DAS Model‡
BJI	CD	1986/07/23 – 1993/06/06	Streckeisen STS-1	IG DJ-1 Borehole SP		ASL 16 bit
	CD	1993/06/09 – 1994/04/15	Streckeisen STS-1 VBB	Geotech GS-13	Kinemetrics FBA-23	ASL 16 bit
BJT	IC	1994/05/25 – 2013/04/17	Streckeisen STS-1 VBB	Geotech GS-13	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/04/17 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
ENH	CD	1986/12/18 – 1997/09/09	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	1997/09/20 – 2013-/05/02	Streckeisen STS-1 VBB	Streckeisen STS-2HG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013-/05/02 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
HIA	CD	1986/07/02 – 1994/12/04	Streckeisen STS-1	IG DJ-1 Borehole SP		ASL 16 bit
	IC	1994/12/04 – 2013/05/10	Streckeisen STS-1 VBB	Geotech GS-13	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/05/10 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
KMI	CD	1986/06/08 – 1996/04/17	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	1996/04/27 – 2013/01/17	Streckeisen STS-1 VBB	Streckeisen STS-2HG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/01/17 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
LSA	CD	1991/11/29 – 1995/07/24	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	1995/08/03 – 2013/05/09	Streckeisen STS-1 VBB	Streckeisen STS-2HG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/05/09 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
LZH	CD	1986/05/31 – 2000/09/02	Streckeisen STS-1	Geotech KS-36000 Borehole		ASL 16 bit
MDJ	CD	1986/10/18 – 1996/11/08	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	1996/11/09 – 2013/05/05	Streckeisen STS-1 VBB	Streckeisen STS-2HG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/05/05 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
QIZ	CD	1986/06/16 – 2001/02/18	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	2001/02/18 – 2013/01/10	Streckeisen STS-2HG		Kinemetrics FBA-23	Quanterra Q680
	IC	2013/01/10 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
SSE	CD	1986/06/28 – 1996/09/15	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	1996/09/19 – 2013/04/27	Streckeisen STS-1 VBB	Streckeisen STS-2HG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/04/27 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
WMQ	CD	1986/09/06 – 1995/09/17	Streckeisen STS-1	IG DJ-1 SP		ASL 16 bit
	IC	1995/09/23 – 2013/04/27	Streckeisen STS-1 VBB	Streckeisen STS-2HG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/04/27 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR
XAN	IC	1992/11/29 – 2013/01/17	Streckeisen STS-1 VBB	Streckeisen STS-2SG	Kinemetrics FBA-23	Quanterra Q680
	IC	2013/01/17 – Present	Streckeisen STS-1 VBB w/ E-300	Streckeisen STS-2.5	Kinemetrics EpiSensor ES-T	Quanterra Q330HR

* Time period shows the dates of operation.

† The secondary sensor models were initially short-period sensors but were replaced by broadband sensors.

‡ DAS, data acquisition system.

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