Recent News

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  • Oct. 1, 2018: Dongdong Tian is awarded President Award, Chinese Academy of Sciences, the highest award for graduate students of Chinese Academy of Sciences.

  • Sep. 12, 2018: Our two papers about the seismic characteristics of North Korea’s September 2017 nuclear test and its triggered aftershock sequences are published online by Seismological Research Letters.

  • Aug. 1, 2018: Dongdong Tian has been officially hired as a postdoctoral Research Associate by Department of Earth and Environmental Sciences, Michigan State University.

  • June 21, 2018: Dongdong Tian has been admitted to the degree of Doctor of Natural Science in Geophysics.

  • May 28, 2018: Dongdong Tian has sucessfully defended his Ph.D. thesis.

Researches

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Inner Core Boundary

Use pre-critically reflected PKiKP waves to study the fine-scale structure of the Earth’s inner core boundary.

North Korea Nuclear Tests

High-precision locations, yields and source characteristics of North Korea’s nuclear tests and associated small seismic events.

Selected Publications

  1. We present high-precision locations and detailed source information of four small seismic events following North Korea’s 2017 nuclear test;
  2. The first event is an on-site collapse 440 m northwest of the test site and best explained by a near vertical single force;
  3. The later events are an earthquake swarm located 8.4 km north of the test site with a focal depth of at least 2.4 km.
Geophys. Res. Lett., 2018

Although existence of a mushy zone in the Earth’s inner core has been hypothesized several decades ago, no seismic evidence has ever been reported. Based on waveform modeling of seismic compressional waves that are reflected off the Earth’s inner core boundary, here we present seismic evidence for a localized 4–8 km thick zone across the inner core boundary beneath southwest Okhotsk Sea with seismic properties intermediate between those of the inner and outer core and of a mushy zone. Such a localized mushy zone is found to be surrounded by a sharp inner core boundary nearby. These seismic results suggest that, in the current thermo-compositional state of the Earth’s core, the outer core composition is close to eutectic in most regions resulting in a sharp inner core boundary, but deviation from the eutectic composition exists in some localized regions resulting in a mushy zone with a thickness of 4–8 km.
Nat. Commun., 2017

Recent Publications

# co-first author
* corresponding author

More Publications

. Source characteristics of North Korea's 3 September 2017 nuclear test. Seismol. Res. Lett., 2018.

Project DOI Citations: 2

. Triggered seismicity after North Korea's 3 September 2017 nuclear test. Seismol. Res. Lett., 2018.

Project DOI Citations: 3

. Collapse and earthquake swarm after North Korea's 3 September 2017 nuclear test. Geophys. Res. Lett., 2018.

Project DOI Citations: 12

. Seismic structure and dynamic process of the Earth's inner core and its boundary. Chinese Journal of Geophysics (in Chinese), 2018.

Project DOI

Recent & Upcoming Talks

More Talks

Collaspe and Earthquake swarm after North Korea's 2017 nuclear test
Jun 15, 2018 1:30 PM
Seismological evidence for a localized mushy zone at the Earth's inner core boundary
Jun 15, 2018 10:15 AM
Fine-scale Structure of the Earth's Inner Core Boundary and Aftershocks of North Korea's 2017 Nuclear Test
Jun 14, 2018 3:00 PM

Resources

Softwares &
Documentations &
Websites

Softwares

HinetPy: A python package to request and process seismic waveform data from Hi-net

Documentations

SAC Reference Manual (in Chinese)
GMT Reference Manual (in Chinese)
GMT Modules Manual (in Chinese)

Websites

SeisMan Blog: My personal academic blog (in Chinese)
GMT Chinese Community (in Chinese)

Professional Services

Awards & Honors

  • 2018: President Award, Chinese Academy of Science, China.
  • 2018: Outstanding Graduate Student, University of Science and Technology of China, China.
  • 2017: Outstanding Student Paper Award, 2017 Annual Meeting of Chinese Geoscience Union, China.
  • 2017: National Scholarship for Doctoral Students, Ministry of Education, China.
  • 2014: Kwang-Hua Scholarship, Kwang-Hua Education Foundation, China.
  • 2010: Kwang-Hua Scholarship, Kwang-Hua Education Foundation, China.
  • 2009: Outstanding Volunteer, University of Science and Technology of China, China.

Contact