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Single-station seismic microzonation using 6C measurements.

Sabrina Keil¹, Joachim Wassermann¹, Heiner Igel¹

¹Department of Earth and Environmental Sciences, LMU Munich, Theresienstraße 41, 80333 Munich, Germany.

Journal of Seismology

|November 1, 2021

Summary

This study introduces a novel single-station microzonation technique combining six-component measurements and H/V spectral ratios. This method enhances seismic site characterization, reducing ambiguity in earthquake hazard assessments.

Keywords:

Ambient noise Microzonation Rotational seismology

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Area of Science:

Seismology
Geophysics
Earthquake Engineering

Background:

Microzonation is crucial for earthquake damage mitigation and urban planning.
Traditional microzonation methods face limitations, particularly regarding inversion result ambiguity.
Induced seismicity necessitates advanced microzonation, even in low-risk regions.

Purpose of the Study:

To present a novel single-station microzonation technique.
To reduce ambiguity in inversion results for near-surface velocity structure.
To improve seismic site characterization for urban areas.

Main Methods:

Combined single-station six-component (6C) measurements (translational and rotational motions) with traditional H/V techniques.
Utilized iXblue blueSeis-3A rotational sensor and Nanometrics Trillium Compact seismometer.
Estimated Love and Rayleigh wave dispersion curves and inverted them with H/V spectral ratios.

Main Results:

Successfully estimated P- and S-wave velocity profiles for the upper 100 m.
Achieved good correlation between inverted velocity models and borehole-derived lithology.
Demonstrated the potential of the single-station approach for microzonation.

Conclusions:

The integrated single-station method effectively reduces ambiguity in microzonation studies.
This approach provides reliable near-surface velocity models for seismic hazard assessment.
The technique shows significant promise for urban microzonation and intelligent building design.