Hierarchical repeating earthquakes with strong downward directivity

{"How":[0],"and":[1,17,25,55,58,72,92,105,118],"to":[2,147],"what":[3],"extent":[4],"earthquakes":[5,31,133],"repeat":[6],"remain":[7],"key":[8],"open":[9],"questions":[10],"with":[11,100],"important":[12],"implications":[13],"for":[14,45],"early":[15],"warning":[16],"hazard":[18],"forecasting.":[19],"Using":[20],"a":[21,26,88],"19-year":[22],"waveform":[23],"dataset":[24],"starting":[27],"catalog":[28],"of":[29,37,53],"repeating":[30],"(repeaters)":[32],"from":[33,144],"small":[34,145],"segments":[35],"(<1%)":[36],"the":[38,125],"Tohoku-Hokkaido":[39],"megathrust,":[40],"we":[41,86],"quantify":[42],"rupture":[43,75,116],"repeatability":[44,76],"∼M3-5.5":[46],"repeaters.":[47,81],"We":[48],"observe":[49],"strong":[50],"spatial":[51],"clustering":[52],"hypocenters":[54],"centroids,":[56],"widespread":[57],"persistent":[59],"hierarchical":[60,89,137],"fault":[61,90],"structures,":[62],"systematic":[63],"downdip":[64],"hypocenter-centroid":[65],"directivity":[66],"that":[67,96],"may":[68,140],"amplify":[69],"coastal":[70],"shaking,":[71],"unexpectedly":[73],"limited":[74],"among":[77],"events":[78],"classified":[79],"as":[80],"To":[82],"interpret":[83],"these":[84],"patterns,":[85],"propose":[87],"model":[91],"define":[93],"\\"hierarchical":[94],"repeaters\\"":[95],"link":[97],"two":[98],"end-members":[99],"similar":[101,106],"initiation":[102],"(hypocenter":[103],"repeaters)":[104],"termination":[107],"(centroid":[108],"repeaters).":[109],"Our":[110],"results":[111],"highlight":[112],"geometric":[113,138],"controls":[114,139],"on":[115,122],"recurrence":[117],"suggest":[119],"intrinsic":[120],"limits":[121],"predictability":[123],"within":[124],"spatially":[126],"restricted,":[127],"preselected":[128],"sample":[129],"analyzed":[130],"here.":[131],"If":[132],"are":[134],"fundamentally":[135],"self-similar,":[136],"operate":[141],"across":[142],"scales,":[143],"repeaters":[146],"giant":[148],"megathrust":[149],"earthquakes.":[150]}