Earthquake and Slow Slip Map (IMAGE) University of Texas at Austin Caption The 7.8 magnitude Kaik?ura earthquake (marked by a red star) triggered a slow slip event (marked by red area) on New Zealand's North Island. The slow slip spanned an area comparable to the state of New Jersey. Both events occurred along a subduction zone, an area where a tectonic plate dives or "subducts" beneath an adjacent tectonic plate. This type of fault is responsible for causing some of the world's most powerful earthquakes. Credit The University of Texas at Austin Jackson School of Geosciences Usage Restrictions Credit image License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.