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We present a new web service, Syngine (http://ds.iris.edu/ds/products/syngine/), running at the IRIS DMC, that offers on-demand and custom tailored seismograms over a broad period range from 1 to 100 seconds, served over HTTP. The free service produces full seismic waveforms including effects like attenuation and anisotropy that are calculated in commonly used spherically symmetric Earth models (PREM, ak135-f, iasp91). Users can freely adjust sources and receivers, retrieve seismograms from finite sources, convolve with arbitrary source time functions, and download Green's functions suitable for moment tensor inversions. Syngine extracts and processes seismograms in as fast as fractions of a second making it suitable for applications demanding short iteration times and a large number of waveforms. For the fist time, researchers without large computational resources or specialized knowledge can easily access high-quality, custom, broadband seismograms. In this manuscript we present the rational and basic principles of our method, including its limitations. Additionally we demonstrate the features of Syngine and the included Earth models, showcase several applications, and discuss future possibilities.

International audienc

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