iPlex Lunch - winter-2015

Jan. 14, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Julian Lozos - Stanford

Seminar Description coming soon.

Jan. 21, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Zachary Ross - USC

We develop a set of algorithms for automatic identification and picking of seismic P and S body waves and fault zone head and trapped phases. The P body wave arrivals are picked using a kurtosis-based algorithm, while S body wave picking is done using polarization analysis and related filters to remove P-wave energy. Then, STA/LTA and kurtosis detectors are used in tandem to lock on a well-defined phase arrival. We search automatically in P waveforms for fault zone head waves generated by earthquakes on faults that separate different lithologies, and in S waveforms for trapped waves resulting from constructive interference in low velocity fault zone layers. The head wave detection and picking is performed by a multi-stage algorithm that accounts for basic characteristics (motion polarities, time difference, sharpness and amplitudes) of head and direct P phases. The algorithm for automatic identification of trapped waves calculates three features representative of trapped waves in time windows following the direct S wave in seismograms of near-fault stations. Statistical analysis of these features is used to identify candidate trapped waves in given stations. The methods are tested on synthetic seismograms and are shown to work well in data recorded along the San Andreas fault near Parkfield, the Hayward fault, the Landers rupture zone, the San Jacinto fault and data from Taiwan.

Jan. 28, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Igor Stubailo - UCLA

Seminar Description coming soon.

Feb. 4, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Han Yue - Caltech

Seminar Description coming soon.

Feb. 11, 2015
noon - 1 p.m.
Geology 707

Presented By:

• Matthew Fox -

Seminar Description coming soon.

Feb. 25, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Kim Blisniuk -

Seminar Description coming soon.

March 4, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Zheng Xing - UCLA

Seminar Description coming soon.

March 11, 2015
noon - 1 p.m.
Geology 1707

Presented By:

• Kaiqing Yuan - Berkeley

Seminar Description coming soon.