Bucharest, the capital of Romania with 2.5 million inhabitants, provides an ideal target to study the urban seismic wave field, which is composed of natural and man-made signal components. The city and surrounding towns in southeast Romania are endangered by strong intermediate-depth earthquakes of the Vrancea source zone (Figure 1). The bigger shocks reach moment magnitudes larger than 7 and occur about three times per century, causing potentially significant death tolls and damage (for a summary see Wenzel et al., 1999). A magnitude 4.5 event from the Vrancea slab is recorded about once a month, and...

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