On the generation and decay of the long-period coda energy of large earthquakes

Xinyu Jiang, Xiaodong Song, Han H. Xia, Richard L. Weaver

Research output: Contribution to journalArticlepeer-review


Seismic coda wave is the tail portion of the earthquake record after main arrivals. Studies on the coda usually focus on high-frequency data within several hours after regional events and attribute them to the scattering effect of the heterogeneities inside the earth. Here, we use records of seven large earthquakes at globally distributed seismic stations to examine the decay of long-period (100 s to 300 s) coda in the time window of 10,000 s to 140,000 s after the origin time and fit it with a statistical model. The geometric spreading effect in the estimated initial energy and a location-independent equivalent attenuation coefficient indicate that the long-period coda energy is less affected by the heterogeneity-induced scattering effect than that of shorter-period coda. The coda energy can reach the earth’s inner core and can be explained by a 1D earth model, making it more effective for constraining the global attenuation model. It also has the potential to determine the magnitudes of large earthquakes and to explore the interior of planetary bodies.

Original languageEnglish (US)
Pages (from-to)103-113
Number of pages11
JournalEarthquake Science
Issue number2
StatePublished - 2021
Externally publishedYes


  • Attenuation
  • Geometric spreading
  • Large earthquakes
  • Long-period coda waves
  • Scattering

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geophysics
  • Geology


Dive into the research topics of 'On the generation and decay of the long-period coda energy of large earthquakes'. Together they form a unique fingerprint.

Cite this