News

  • Sep. 20, 2018: The paper on source characteristics of North Korea’s 2017 nuclear test has been published online at SRL.

  • Sep. 20, 2018: The paper on triggerred seismicity after North Korea’s 2017 nuclear test has been published online at SRL.

  • Aug. 1, 2018: Jiayuan Yao commenced to work as a research fellow at the School of Physical & Mathematical Sciences at Nanyang Technological University.

  • Previous news

Research Projects

Nuclear test

Determination the high-precision locations, yields, and source characteristics of North Korea’s nuclear tests, and the locations and source characteristics of the following seismic events based on seismological observations.

Repeating earthquakes

Build a global repeating earthquake dataset, and use it to study internal structure of the Earth and its change with time.

Lower mantle

Study seismic structure of lower mantle using travel times of S, ScS, P and ScP phases, and PKP precursors.

Inner core boundary

Study the temporal change of the Earth’s inner core surface by analyzing the changes of PKIKP and PKiKP travel times of repeating earthquakes.

Selected Publications

# co-first author

  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

We report two decades of changing behavior of the Earth’s inner core boundary (ICB), which provides the simplest explanation for the observed temporal change of the compressional seismic waves that are reflected from the ICB (PKiKP) and refracted in the inner core (PKIKP), from earthquake doublets occurring in South Sandwich Islands between 1993 and 2013. The seismic results indicate that ICB temporal change occurs in localized regions and is episodic, rapidly migrating, and alternately enlarged and shrunk.
J. Geophys. Res. Solid Earth, 2015

Recent Publications

# co-first author

More Publications

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

PDF Project citation(1)

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

PDF Project citation(1)

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

PDF Project

. Two decades of temporal change of Earth's inner core boundary. J. Geophys. Res. Solid Earth, 2015.

PDF Project citation(5)

Recent & Upcoming Talks

More Talks

Detection and location of small seismic events
Jul 3, 2018 14:30
Seismic monitoring of North Korea’s 3 September nuclear test
Jun 15, 2018 14:00

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