KIT –The Resea ch Uni e si y in he Helmhol z Associa ion
Unde s anding he in luence o seismic man le
s uc u es a he CMB on in ense magne ic lux egions
Y onne F öhlich1, Ha ini Thiyaga ajan2, Lena Tölle2, Joachim R. R. Ri e 1, Ch is ine Thomas2
1Ka ls uhe Ins i u e o Technology, Geophysical Ins i u e, Ka ls uhe, Ge many
2Uni e si y o Müns e , Ins i u e o Geophysics, Müns e , Ge many
Re e ences & Acknowledgemen s
DeepDyn - DFG P io i y
P og am 2404
Ta ge egions: LMM below
Sibe ia
e y s able magne ic ield
Canada
mo e mobile magne ic ield
No h A lan ic
unclea , expec ed due o symme y
Indonesia
mobile, wes wa d mo emen
Aims: Unde s anding o
Seismic s uc u e and aniso opy
De o ma ion
Mine alogy om seismic obse a ions and
de o ma ion
The mal conduc i i y om pe o-physical
modeling
Sea ch o shea wa e spli ing
SKS, SKKS (XKS) phases
S, ScS phases
→ spli ing pa ame e s, spli ing in ensi y
Sea ch o phase pai disc epancies
→ LMM man le con ibu ion
Sea ch o D" e lec ions
PdP, SdS phases
PdS, SdP phases
→ a el ime, ampli ude, pola i y
Calcula ion o e lec ion coe icien s
→ eloci y con as ac oss he D" e lec o
Conside a ion o di e en scena ios in he LMM
mine als
s uc u es
Wa e p opaga ion
backazimu h-dependen
shea wa e spli ing o XKS
e lec ion coe icien s o P, S
We s udy he lowe mos man le (LMM) wi h seismological me hods as con ibu ion o he DFG P io i y P og am 2404 “Recons uc ing he Deep
Dynamics o Plane Ea h o e Geologic Time – DeepDyn”. Fo his we explo e aniso opy and e lec o s a he co e-man le bounda y (CMB).
Speci ic s udy a eas a e he geomagne ic high-la i ude lux loops (HLFL) whe e dense bundles o magne ic ield lines a e p oposed. In he i s
unding pe iod we concen a e on he no he n hemisphe e a spo s in he LMM below Canada, he No h A lan ic and Sibe ia as well as Indonesia.
•YF is suppo ed by DFG g an RI1133/14-1 (SPP 2404 DeepDyn).
•HT is suppo ed by DFG g and TH1530/25-1 (SPP 2404 DeepDyn).
Seismic Models
Clus e analysis
(Lekic e al., 2012)
5 models
low S wa e eloci ies
Vo emap analysis
(Shepha d e al., 2017)
7 models
high S wa e eloci ies
Shea wa e
spli ing da abase
(Wüs e eld e al., 2009)
Lib a y o elas ic enso s
o LMM seismic aniso opy
(C easy e al., 2020)
MATLAB Seismic
Aniso opy Toolbox (MSAT)
(Walke and Wookey, 2010)
Seismic Aniso opy
Inclusion o Exis ing Models and Da abases
Modeling
AxiSEM2D AxiSEM3D
•Ami e al., 2011.
•Jackson e al., 2000.
Deep man le
aniso opy da abase
(Wol e al., 2023)
SKS-SKKS
LLSVP
S-ScS
Kendall e al., 2014; modi ied.
Ray pa hs a e iasp91 Ea h model (Kenne 1999).
Calcula ion wi h auP (C o well e al., 1999).
Seismology: Combina ion o wo app oaches
•Geog aphic maps we e gene a ed wi h PyGMT and GMT.
•The gu m1 model was gene a ed wi h pymagglobal.
Seismic Re lec ions
