A LiDAR and field study of surface rupture and post-seismic slip for the 6th April 2009 L'Aquila Earthquake (M6.3). (URGENCY GRANT)

正常断层地震会产生同震垂直运动，在主震发生后的数天和数周内，这种运动被观察到会被放大，这一过程被称为“震后蠕变”或“震后滑动”。量化同震和震后运动的相对贡献是至关重要的，以便解释(a)地震多年后进行断层滑动测量的古地震观测，或(b)必须从地表破坏/震动强度记录推断地震震级的历史文献，因为如果没有这些约束，这些数据集所隐含的事件震级将存在相当大的不确定性。此外，如果与其他大地测量数据集相结合，与这种地震后蠕变相关的振幅、波长和时间尺度也可能约束发震断层的流变变化和重新加载。我们将使用激光雷达扫描2009年4月6日意大利中部拉奎拉正常断层地震破裂（6.3级）的代表性地点，在事件发生后立即进行扫描，并在接下来的几周内再次对浅层后滑动进行量化。与我们同行的还有民防当局（e. Vittori博士及其团队、罗马APAT自然灾害部门主管、罗马国家地质与火山研究所S. Barba博士及其团队），他们将帮助我们进入现场，并在地震发生后立即开始绘制断层图。我们在意大利中部的地震地质、激光雷达扫描、地震和断层力学方面已经建立了专业知识，此外，这次地震发生在我们目前正在NERC资助（NE/E01545X/1）研究地震复发的地区。

Normal faulting earthquakes produce coseismic vertical motions that have previously been observed to amplify during the days and weeks after the mainshock by a process known as 'postseismic creep' or 'after-slip'. It is vital to quantify the relative contributions of coseismic and postseismic motion in order to interpret (a) palaeoseismic observations where measurements of fault slip are made many years after the earthquake, or (b) historical documents where earthquake magnitude must be inferred from records of surface damage/shaking intensity, as without such constraints there is considerable uncertainty in the magnitude of the event implied by these data sets. Furthermore, if combined with other geodetic data sets, the amplitude, wavelength and timescales associated with such postseismic creep can also potentially constrain rheological changes and reloading of seismogenic faults. We will use LiDAR to scan a representative number of locations along the 6th April 2009 normal faulting earthquake rupture in L'Aquila in central Italy (M 6.3), in the immediate aftermath of the event and again in the coming weeks to quantify shallow after-slip. We will be accompanied by civil protection authorities (Dr. E. Vittori and his team; Head of Natural Hazards Unit at APAT - Agenzia per la Protezione dell'Ambiente e per i Servizi Technici, Rome; Dr. S. Barba and his team, Rome, Istituto Nazionale di Geofisica e Vulcanologia, Rome), who will help us to access sites, and who initiated mapping of ruptures immediately after the earthquake. We have established expertise in the earthquake geology of central Italy, LiDAR scanning, the mechanics of earthquakes and faulting and, moreover, this earthquake occurred in an area where we are currently working on earthquake recurrence as part of NERC grant (NE/E01545X/1).