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SUMMARY:The 2021 Mw 8.1 Kermadec Earthquake Sequence: Deep Megathrust Slip
  Nucleation and M8 Rupture along the Slab-Mantle Contact - Lingling Ye -- 
 Southern University of Science and Technology
DTSTART:20231129T160000Z
DTEND:20231129T170000Z
UID:TALK207823@talks.cam.ac.uk
CONTACT:Yihe Xu
DESCRIPTION:Typical plate boundary earthquakes in global subduction zone o
 ccurred along the contact between the crust in the upper plate and subduct
 ing slab. On 4 March 2021\, a magnitude 8.1 earthquake struck the northern
  Kermadec\, the largest known plate boundary event along the 1000-km long 
 Kermadec subduction zone. It was preceded by a magnitude 7.4 foreshock at 
 1 hr 47 min earlier. Using teleseismic\, geodetic and tsunami data\, we fi
 nd all substantial coseismic slip is located along the slab-mantle interfa
 ce\, with the foreshock nucleating near the downdip edge of the mainshock\
 , and no significant shallow slip. Significant overlap of the slip regions
  between major foreshock and mainshock with a moderate number of small eve
 nts occurred between them suggest a cascading faulting process. Extensive 
 aftershocks locate updip along the slab-crust interface\, which has hosted
  substantial prior moderate earthquake activity. The 200-km long slab-mant
 le interface in the northern Kermadec\, the only region with major megathr
 ust earthquakes along Kermadec subduction\, has 11 M7+ deep megathrust ear
 thquakes\, including the 1976 M8 sequence. It provides a rare example of g
 reat rupture on the slab-mantle interface to understand frictional propert
 ies for olivine.
LOCATION:Wolfson Lecture Theatre (virtual)
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