|Title||Quake clamps down on slow slip|
|Publication Type||Journal Article|
|Year of Publication||2014|
|Authors||Wallace L.M, Bartlow N., Hamling I., Fry B.|
|Journal||Geophysical Research Letters|
|Type of Article||Article|
|Keywords||deformation; earthquakes; events; friction; New Zealand; new-zealand; sequence; slow slip events; stress change; stress transfer; subduction; subduction zone; tohoku-oki earthquake|
Using continuous GPS (cGPS) data from the Hikurangi subduction zone in New Zealand, we show for the first time that stress changes induced by a local earthquake can arrest an ongoing slow slip event (SSE). The cGPS data show that the slip rate in the northern portion of the 2013/2014 Kapiti SSE decreased abruptly following a nearby intraslab earthquake. We suggest that deceleration of the Kapiti SSE in early 2014 occurred due to a tenfold increase in the normal stress relative to shear stress in the SSE source, induced by the nearby M-w 6.3 earthquake, consistent with expectations of rate and state friction. Our observation of an abrupt halting/slowing of the SSE in response to stress changes imposed by a local earthquake has implications for the strength of fault zones hosting SSEs and supports the premise that static stress changes are an important ingredient in triggering (or delaying) fault slip.