Rosenberger (2009) has highlighted some of the considerable advantages of modern digital strong-motion instruments over the older analogue ones. Specifically, he points out that the need for event-triggered recording is no longer necessary, especially when the new instruments have the capability of continuously recording data and using the Internet for communications.

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Continuous data has the clear advantage of complete event coverage. As Halldórsson and Avery (2009, hereafter “HA09”) identified, a weakness in the proposed scheme is the reliance of communications during the initial stage of the event for issuing triggers to instruments that would not trigger...

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