WEBVTT Kind: captions Language: en-US 00:00:00.880 --> 00:00:04.136 Good afternoon. My name is Mike Oskin. 00:00:04.160 --> 00:00:07.520 Along with Tran Huynh, we’re representing SCEC on this 00:00:07.520 --> 00:00:12.240 earthquake response panel today. This is a presentation that many of you 00:00:12.240 --> 00:00:15.120 have probably seen versions of at the SCEC meeting in the past 00:00:15.120 --> 00:00:19.816 just summarizing SCEC’s role in earthquake response planning. 00:00:19.840 --> 00:00:25.816 So SCEC does have a post-earthquake rapid response scientific mission. 00:00:25.840 --> 00:00:29.896 We collaborate with state and federal agencies that have the statutory 00:00:29.920 --> 00:00:33.120 responsibilities to respond to earthquakes, and our goal is that, 00:00:33.120 --> 00:00:37.120 by working together, the SCEC community, which involves academic, 00:00:37.120 --> 00:00:43.200 industry, and the federal and state agencies, we can achieve a more 00:00:43.200 --> 00:00:46.136 effective rapid scientific response to earthquakes. 00:00:46.160 --> 00:00:50.000 So what SCEC does is provide some intellectual leadership 00:00:50.000 --> 00:00:53.760 spanning the breadth of earthquake system science, from the observations 00:00:53.760 --> 00:00:58.160 to the modeling, for example, to the outcomes. 00:00:58.160 --> 00:01:01.120 Coordination of the response, particularly with the academic 00:01:01.120 --> 00:01:05.120 science community. And contributing to the communication of knowledge 00:01:05.120 --> 00:01:12.000 to the world at large. So it’s really important that SCEC is coordinating 00:01:12.000 --> 00:01:16.696 with agencies so that we align our earthquake response science goals, 00:01:16.720 --> 00:01:20.400 that we integrate the structured leadership and planning that agencies 00:01:20.400 --> 00:01:23.920 like the USGS undertake, with guiding what is really 00:01:23.920 --> 00:01:27.200 an emergent open collaboration that forms among the 00:01:27.200 --> 00:01:30.376 SCEC community during earthquake response. 00:01:30.400 --> 00:01:33.520 It’s essential that we ensure open real-time collaboration and 00:01:33.520 --> 00:01:37.520 data sharing between all entities involved and that we have 00:01:37.520 --> 00:01:41.976 a managed coordinated and uncoordinated media outreach. 00:01:42.000 --> 00:01:46.880 SCEC is also involved in securing financial support for immediate 00:01:46.880 --> 00:01:51.840 response activities through generating proposals and planning and leading 00:01:51.840 --> 00:01:58.000 and funding for post-earthquake experiments and practicing 00:01:58.000 --> 00:02:00.592 for future earthquakes. 00:02:01.120 --> 00:02:06.296 So what are the science questions that drive our earthquake response mission? 00:02:06.320 --> 00:02:09.280 Well, one is, how does an earthquake sequence unfold, 00:02:09.280 --> 00:02:15.096 leading to the nucleation of a large aftershock or even a larger event, 00:02:15.120 --> 00:02:18.056 say like what happened in the Ridgecrest sequence? 00:02:18.080 --> 00:02:20.080 How does the path of radiated seismic energy 00:02:20.080 --> 00:02:22.856 and site conditions affect strong ground motion? 00:02:22.880 --> 00:02:27.656 How variable is fault slip, and what is the nature of the surface slip deficit? 00:02:27.680 --> 00:02:32.536 How are large stress changes dissipated around faults following the earthquake? 00:02:32.560 --> 00:02:36.536 What are the depth- and time-dependent properties of fault damage and healing? 00:02:36.560 --> 00:02:40.640 And what is the rheology of the fault zone and it’s lower crustal roots 00:02:40.640 --> 00:02:43.680 and the upper mantle? All of these are questions that can be 00:02:43.680 --> 00:02:48.373 addressed through the ephemeral data produced by an earthquake sequence. 00:02:49.360 --> 00:02:53.440 So an important aspect of this is coordination of observations. 00:02:53.440 --> 00:02:58.560 And these run through a whole different set of disciplines – aftershock 00:02:58.560 --> 00:03:02.960 monitoring, geodetic monitoring, geologic mapping of the surface rupture 00:03:02.960 --> 00:03:09.496 and imaging, post-seismic deformation observations, forecasting in real time 00:03:09.520 --> 00:03:13.760 earthquake probabilities, characterizing the effects of strong ground motion. 00:03:13.760 --> 00:03:16.400 And, over a slightly longer time scale, 00:03:16.400 --> 00:03:21.710 perhaps fault zone drilling to ascertain the properties of the fault zone at depth. 00:03:22.480 --> 00:03:27.896 SCEC tries to coordinate their activities through its response portal. 00:03:27.920 --> 00:03:33.176 It is a priority to update this response portal to be more mobile-friendly. 00:03:33.200 --> 00:03:37.096 It has served us well in a number of events over the last couple of decades. 00:03:37.120 --> 00:03:41.360 It’s an event-based forum that’s very low-friction and easy to use and 00:03:41.360 --> 00:03:45.680 browse and share anything you want. And the idea is really just to make 00:03:45.680 --> 00:03:49.256 that low-friction site for people to share information. 00:03:49.280 --> 00:03:53.200 The website is response.scec.org, and anyone with a SCEC login, 00:03:53.200 --> 00:03:56.000 which you need to register for the SCEC annual meeting, 00:03:56.000 --> 00:03:59.597 you also have a login to this site. 00:04:01.040 --> 00:04:06.080 So what are we – what is the objective of coordination of earthquake response? 00:04:06.080 --> 00:04:09.256 Well, really it comes down to ephemeral data. 00:04:09.280 --> 00:04:14.240 Aftershock and geodetic monitoring – it’s ideal to try and get instruments 00:04:14.240 --> 00:04:19.976 deployed within a day of the event to capture fault afterslip, 00:04:20.000 --> 00:04:24.136 maybe even capture large aftershocks in great detail. 00:04:24.160 --> 00:04:27.360 It’s important to conduct surface rupture mapping and imaging, 00:04:27.360 --> 00:04:32.080 although the nature of that is changing. Really the ephemeral data that 00:04:32.080 --> 00:04:36.320 disappears the most quickly is often the detailed offsets of features, whereas 00:04:36.320 --> 00:04:42.160 mapping out the fault planes and assessing the whole deformation picture 00:04:42.160 --> 00:04:48.696 is now supplemented with imaging from InSAR, optical imaging, and Lidar. 00:04:48.720 --> 00:04:52.480 Post-seismic deformation – it’s important to define rupture endpoints, 00:04:52.480 --> 00:04:57.096 identify afterslip, and strategically deploy geodetic instrumentation. 00:04:57.120 --> 00:05:00.216 And the sooner it’s deployed, the better that signal. 00:05:00.240 --> 00:05:04.787 Operational earthquake forecasting – ideally, we like to have telemetered 00:05:04.787 --> 00:05:08.400 aftershock data to capture focal mechanisms, ideally down to 00:05:08.400 --> 00:05:11.816 magnitude zero completeness and as soon as possible, 00:05:11.840 --> 00:05:15.836 right during when the aftershock sequence is most productive. 00:05:16.640 --> 00:05:19.040 Strong ground motion characterization – identifying 00:05:19.040 --> 00:05:22.640 unusual damage due to anomalous shaking and deploying instrumentation 00:05:22.640 --> 00:05:26.216 to try and understand the path and site effects that led to that. 00:05:26.240 --> 00:05:31.096 And then fault zone drilling is a large coordinated experiment 00:05:31.120 --> 00:05:36.536 that SCEC is suited to contribute to developing. 00:05:36.560 --> 00:05:39.760 And I’m going to wrap it up there. Thank you for your time.