Field Survey of the February 17, 1996 Irian Jaya Tsunami

这项行动是为了支持美国研究人员参与国际努力，从1996年2月17日的伊里安查亚地震和海啸中汲取教训，以收集和研究易腐烂的洪水数据。参加者将加入国际海啸调查队，该调查队调查了1992-1994年世界范围内的6次海啸事件，建立了一个小而有价值的洪水数据数据库。1996年2月17日，印度尼西亚东部伊里安查亚附近的比亚克岛发生强烈地震。地震产生的海啸波传播到日本，在那里测量到的衰减波的高度约为一米，据报道，到达美国西海岸时的波高高达7厘米。美国参与者将：(1)测量不同地点的最大穿透点（最大累积），(2)尝试估计海啸淹没速度，以及(3)采访目击者以确定所观察到的累积波的性质和数量。由于灾后重建工作即使不是几小时，也要在几天后才开始，因此前期数据非常容易丢失。即使在偏远地区，风暴和风浪也可能改变地形或分散用于估计穿透点位置的碎片线。正是由于这个原因，必须在海啸发生后尽快前往现场，记录破坏性海啸对海岸的影响。上升高度分布的准确信息将有助于更好地定义构造震源运动，从而可以校准震源模型以备将来使用。预计该团队将能够在调查中获得剖面数据，这些数据将用于增强建模，并评估海滩地形对一阶预测的重要性。＊＊＊

9633792 Synolakis This action is to support the participation of U.S. researchers in the international effort to learn from the February 17, 1996 Irian Jaya earthquake and tsunami, in order to gather and study perishable inundation data. The participants will join the International Tsunami Survey Team which has surveyed six of the 1992-1994 worldwide events, resulting in a small but valuable database of inundation data. On February 17, 1996, a strong earthquake shook Biak Island off Irian Jaya in East Indonesia. The earthquake-generated tsunami waves propagated to Japan, where the measured height of the attenuated waves was approximately one meter, with a reported wave height on reaching the west coast of the United States of up to 7cm. The US participants will: (1) measure maximum penetration points (maximum runup) at different locations, (2) attempt to estimate tsunami inundation velocities, and (3) interview eyewitnesses to determine the nature and number of runup waves observed. Runup data are highly perishable, given that reconstruction efforts start a few days, if not hours, after the event. Even in remote areas, storms and wind-generated waves may alter the topography or scatter the debris line which is used for estimating the location of the penetration points. It is for this reason that travel to the site must occur as soon as possible after the event to document the coastal effects of a damaging tsunami. Accurate information of the runup height distribution will allow a better definition of the tectonic source motion, which in turn will permit the calibration of a source model for future use. It is anticipated that the team will be able to obtain profile data in the survey which will be used both to augment the modeling, and also to evaluate how important beach topography is for first- order predictions. ***