Improving the robustness of the advanced LIGO detectors to earthquakes

• DOI: 10.1088/1361-6382/abbc8c
• Publication Date: 2020-11-06T08:55:54Z
• Authors: E Schwartz; A Pele; J Warner; B Lantz; J Betzwieser; K L Dooley; S Biscans; M Coughlin; N Mukund; R Abbott; C Adams; R X Adhikari; A Ananyeva; S Appert; K Arai; J S Areeda; Y Asali; S M Aston; C Austin; A M Baer; M Ball; S W Ballmer; S Banagiri; D Barker; L Barsotti; J Bartlett; B K Berger; D Bhattacharjee; G Billingsley; C D Blair; R M Blair; N Bode; P Booker; R Bork; A Bramley; A F Brooks; D D Brown; A Buikema; C Cahillane; K C Cannon; X Chen; A A Ciobanu; F Clara; S J Cooper; K R Corley; S T Countryman; P B Covas; D C Coyne; L E H Datrier; D Davis; C Di Fronzo; J C Driggers; P Dupej; S E Dwyer; A Effler; T Etzel; M Evans; T M Evans; J Feicht; A Fernandez-Galiana; P Fritschel; V V Frolov; P Fulda; M Fyffe; J A Giaime; K D Giardina; P Godwin; E Goetz; S Gras; C Gray; R Gray; A C Green; Anchal Gupta; E K Gustafson; R Gustafson; J Hanks; J Hanson; T Hardwick; R K Hasskew; M C Heintze; A F Helmling-Cornell; N A Holland; J D Jones; S Kandhasamy; S Karki; M Kasprzack; K Kawabe; N Kijbunchoo; P J King; J S Kissel; Rahul Kumar; M Landry; B B Lane; M Laxen; Y K Lecoeuche; J Leviton; J Liu; M Lormand; A P Lundgren; R Macas; M MacInnis; D M Macleod; G L Mansell; S Márka; Z Márka; D V Martynov; K Mason; T J Massinger; F Matichard; N Mavalvala; R McCarthy; D E McClelland; S McCormick; L McCuller; J McIver; T McRae; G Mendell; K Merfeld; E L Merilh; F Meylahn; T Mistry; R Mittleman; G Moreno; C M Mow-Lowry; S Mozzon; A Mullavey; T J N Nelson; P Nguyen; L K Nuttall; J Oberling; Richard J Oram; C Osthelder; D J Ottaway; H Overmier; J R Palamos; W Parker; E Payne; C J Perez; M Pirello; H Radkins; K E Ramirez; J W Richardson; K Riles; N A Robertson; J G Rollins; C L Romel; J H Romie; M P Ross; K Ryan; T Sadecki; E J Sanchez; L E Sanchez; T R Saravanan; R L Savage; D Schaetzl; R Schnabel; R M S Schofield; D Sellers; T Shaffer; D Sigg; B J J Slagmolen; J R Smith; S Soni; B Sorazu; A P Spencer; K A Strain; L Sun; M J Szczepańczyk; M Thomas; P Thomas; K A Thorne; K Toland; C I Torrie; G Traylor; M Tse; A L Urban; G Vajente; G Valdes; D C Vander-Hyde; P J Veitch; K Venkateswara; G Venugopalan; A D Viets; T Vo; C Vorvick; M Wade; R L Ward; B Weaver; R Weiss; C Whittle; B Willke; C C Wipf; L Xiao; H Yamamoto; H Yu; H Yu; L Zhang; M E Zucker; J Zweizig
• Keywords: Robustness

Teleseismic, or distant, earthquakes regularly disrupt the operation of ground--based gravitational wave detectors such as Advanced LIGO. Here, we present \emph{EQ mode}, a new global control scheme, consisting an automated sequence optimized filters that reduces and coordinates motion seismic isolation platforms during earthquakes. This, in turn, suppresses differential interferometer arms with respect to one another, resulting reduction DARM signal at frequencies below 100\,mHz. Our method greatly improved interferometers' capability remain operational earthquakes, ground velocities up 3.9\,$\mu \mbox{m/s}$ rms beam direction, setting record for both detectors. This sets milestone controls LIGO detectors' ability manage high induced by opening path further robust other extreme environmental conditions.