Contact 

Research 

Publications 

Teaching 

Workshops 

Dr. Céline Hadziioannou

Junior Professor in Seismology, University of Hamburg

former Emmy Noether Fellow, project title: "The origin of Love waves in the ocean generated noise wave field"

Contact:

University of Hamburg
Institute of Geophysics
Bundesstrasse 55
20146 Hamburg -- Germany

email: celine.hadziioannou [at] uni-hamburg.de
Tel. +49 (0)40 42838 2980

CV

Research

Noise correlations have revolutionized seismology. They make it possible to exploit the vast amounts of background noise recorded continuously around the world. In a way, they allow us to exploit seismic noise to perform earthquake-free seismology. The resulting explosion of high-resolution tomographic images in the past decade provides us with better event locations, better strong motion predictions and a deeper understanding of crustal dynamics. All of these have important implications for natural hazard management.
Noise correlations have also been used successfully to monitor wave speed changes over time in potentially dangerous structures such as landslides, volcanoes and active fault zones. Most of the applications so far have concentrated on the vertical component records, but recently more interest arises to include the information contained in the horizontal components.

However, as the methods employed are developed and become more accurate, their drawbacks are becoming more apparent. One of the problems in noise correlation, is that the resulting "Green's function" does not only carry the wanted information about the propagation medium, but also about the noise sources. Therefore, to improve the noise correlation technique, it is important to have a good understanding of the noise sources and their behavior. The sources of the vertical component motion in microseismic Rayleigh waves are already widely studied, while those for the horizontal shear motions in Love waves remain relatively unexplored. My research aims at characterizing and understanding Love waves in ambient seismic noise, and their contribution to noise correlation methods. Several fundamental questions are addressed:

How are microseismic Love waves generated?
Where are Love waves generated? What are the geographic differences compared to Rayleigh wave generation areas?
How much energy do Love waves contribute to seismic noise? How does this depend on the frequency?
When are the strongest Love waves generated? Does their frequency content change over time?

Tools

Rotational Seismology Event Database

Online access to more than 17,000 Earthquake waveforms and processed plots from signals recorded simultaneously by the Wettzell ring laser and a nearby seismometer.

Publications

Teaching

Seismologie
(BSc, 6. Semester, 2017)

Seismologie Seminar
(MSc, 2017)

Geophysical Data Analysis
(MSc, 2016)

Practical: Noise spectra & polarization
1st TIDES (EU COST) Advanced Training School, Bertinoro (Italy), 1-5 June 2015

Geophysical Data Analysis
(MSc, 2015)

Geophysikalische Datenanalyse
(BSc, 2015)

Geophysical Data Analysis
(MSc, 2014)

ROSE School: Signal Processing and Geophysical Data Analysis
(MSc, winter school 2012)


Workshops

4th IWGoRS Meeting on rotational seismology in Tutzing, Germany
20-23 June, 2016

AMÜSE PhD conference, Hinterriss, Austria
10-12 June, 2016

Hum workshop at the Center for Advanced Studies in Munich (CAS)
September 12, 2014

4th Quest workshop in Benodet, France
May 19-25, 2013

Neustadt workshop on "Noise and Diffuse Wavefields"
11-14 November 2012

Selected Presentations