KIT –The Resea ch Uni e si y in he Helmhol z Associa ion
In es iga ion o seismic aniso opy in he D’’ laye
using XKS pai s
F öhlich Y onne, Do n Fiona, Dillah Muhammad I. F., Ri e Joachim R. R.
Ka ls uhe Ins i u e o Technology (KIT), Geophysical Ins i u e (GPI), Ka ls uhe, Ge many
Re e ences & Acknowledgemen s
•YF is suppo ed by DFG g an RI1133/14-1 (SPP 2404 DeepDyn).
•Shea wa e spli ing measu emen s we e pe o med wi h Spli Lab 1.2.1 (Po i , 2014).
•Co ec ion o e o calcula ion in Spli Lab a e Walsh e al., 2013, h ps://doi.o g/10.1002/jg b.50386.
•Co ec ion o empo al alignmen in Spli Lab a e F öhlich e al., 2022, h ps://doi.o g/10.4401/ag-8781.
•Geog aphic maps we e gene a ed wi h PyGMT 0.13.0 (Tian e al., 2024) and GMT 6.5.0 (Wessel e al., 2024).
•Colo -coding was accomplished using colo maps o cmocean (Thyng e al., 2016) and Scien i ic colou maps 8.0.1 (C ame i, 2023).
•C easy e al., 2020, G3, h ps://doi.o g/10.1029/2019GC008883.
•C o well e al., 1999, SRL, h ps://doi.o g/10.1785/gss l.70.2.154.
•G und & Ri e , 2019, Geology, h ps://doi.o g/10.1130/G45514.1.
•Kenne e al., 1991, Te a No a h ps://doi.o g/10.1111/j.1365-3121.1991. b00863.x.
•Leng e al., 2016, GJI, h ps://doi.o g/10.1093/gji/ggw363.
•Leng e al., 2019, GJI, h ps://doi.o g/10.1093/gji/ggz092.
•Nowacki e al., 2011, J. o Geodyn., h ps://doi.o g/10.1016/j.jog.2011.04.003.
•Piscon i e al., 2021, JGR Solid Ea h, h ps://doi.o g/10.1029/2018JB016993.
•Walke & Wookey, 2012, Compu . Geosci., h ps://doi.o g/10.1016/j.cageo.2012.05.031.
•Wol e al., 2023, G3, h ps://doi.o g/10.1029/2023GC011070.
•Wüs e eld e al., 2007, Compu . Geosci., h ps://doi.o g/10.1016/j.cageo.2007.08.002.
•Wüs e eld e al., 2009, Phys. Ea h Plane . In ., h ps://doi.o g/10.1016/j.pepi.2009.05.006.
Shea wa e spli ing (SWS) can be used o de ec seismic aniso opy in he lowe mos man le (LMM) based on phase pai disc epancies, in pa icula
by analyzing SKS and SKKS phases. Wi hin he DFG P io i y P og am (SPP) 2404 "Recons uc ing he Deep Dynamics o Plane Ea h o e Geologic
Time” (DeepDyn) we in es iga e a ge egions associa ed wi h in ense magne ic lux. In he i s unding pe iod we concen a e on he no he n
hemisphe e, especially on he LMM benea h Sibe ia, he No h A lan ic, Canda and Indonesia. This pos e ocuses on he a ge egions Sibe ia and
No h A lan ic and shows SWS measu emen s and SKS-SKKS pai s a he eco ding s a ion KEF (HE) in Finland. Fo he a ge egion Indonesia, see
he pos e by Tölle e al. (2024) and o a gene al o e iew on D'' s uc u es in hese a ge egions, isi he alk by Thiyaga ajan e al. (2024).
Shea wa e spli ing
PKS, SKS, SKKS (XKS) phases
S, ScS phases
→ Spli ing pa ame e s, spli ing in ensi y
Phase pai disc epancies
SKS s. SKKS
→ LMM man le con ibu ion
Me hod
Nowacki e al. (2011); Fig. 2, modi ied.
Ray pa hs and a el imes a e iasp91 Ea h model by Kenne e al. (1991).
Calcula ion wi h he Ja a TauP Toolki by C o well e al. (1999).
SKS-SKKS pai s
A lan ic Sibe ia
AlpA ay ScanA ay USA ay
SKKS – spli SKKS – spli
SKS – null
SKS – null
Modeling
Lib a y o elas ic enso s o LMM aniso opy → C easy e al. (2020)
Conside a ion o di e en mine als
MATLAB Seismic Aniso opy Toolbox → Walke & Wookey (2012)
Conside a ion o di e en aniso opy sou ces → Nowacki e al. (2011)
Conside a ion o phase ansi ions and slip sys ems → Piscon i e al. (2021)
→ Se up di e en aniso opy / spli ing and e lec ion scena ios
AxiSEM2D / AxiSEM3D → Leng e al. (2016, 2019)
Simula ions o wa e p opaga ion
Gene a ion o syn he ic seismog ams
→ Measu e shea wa e spli ing o SKS-SKKS, S-ScS phase pai s
→ Calcula e e lec ion coe icien s o P, S phases
Piscon i e al. (2021); Fig. 5, sligh ly modi ied.
mine als s uc u es
LPO SPO
Da a
A
l
a
n
i
c
S
i
b
e
i
a
Teleseismic ea hquakes
Time window: Augus 2006 – July 2017
Epicen al dis ance: Δ= [80, 140]°
Momen magni ude: Mw > 5.5
Hypocen al dep h: hd > 20 km
Finnish eco ding s a ion
S a ion code: KEF
Ne wo k code: HE
LLVPs and XKS LMM aniso opy da abase compiled by Wol e al. (2023).
KEF
