Annual Meeting - SCEC.org

More documents

Recommendations

Info

Poster Abstracts COMPOUND EARTHQUAKES ON A BIMATERIAL INTERFACE AND IMPLICATIONS FOR RUPTURE MECHANICS (B-040) E. Wang and A.M. Rubin Rubin and Ampuero [2007] simulated slip-weakening ruptures on a 2-D (line fault) bimaterial interface and observed differences in the timescales for the two edges to experience their peak stress after being slowed by barriers. The barrier on the "negative" side reached its peak stress when the P-wave stopping phase arrives from the opposite end, which takes ~20 ms for a 100 m event. This may be long enough for a potential secondary rupture to be observed as a distinct subevent. In contrast, the same timescale for a barrier at the "positive" front is nearly instantaneous, possibly making a secondary event there indistinguishable from the main rupture. Rubin and Gillard [2000] observed that 5 of a family of 72 similar earthquakes along the San Andreas fault in Northern California are compound and in all cases the second event was located on the negative (NW) side of the main event. Based on their simulations, Rubin and Ampuero interpreted this as being due to the abovementioned asymmetry in the dynamic stressing-rate history on the two sides of a rupture on a bimaterial interface. In this study, we search more systematically for secondary arrivals within 0.15 s of the first P arrival for microearthquakes on the San Andreas. Using an iterative deconvolution method described in Kikuchi & Kanamori [1982], we deconvolve the first 0.64 s following the P arrival of a target event using a nearby Empirical Green's Function (EGF). When the EGF is a simple earthquake and the target is compound, the deconvolution result is expected to show two positive spikes, corresponding to the main and secondary events. A subevent is considered robust only when the difference between the waveforms of the target event and the aligned and scaled EGF is similar enough to the EGF at multiple stations. The azimuthal consistency of delays between the main and secondary arrivals is more convincing evidence that the target is a compound event. Using these criteria we temporarily identified ~70 compound events out of ~8300 in our catalog. Future work will include improving the quality of the inter-event delay time by using Monte Carlo simulations to allow the amplitudes and arrival times of both spikes (as opposed to just the second spike) to vary. Accurate relative locations and times can improve our understanding of the triggering mechanism of the subevents and perhaps the longer-timescale aftershock asymmetry observed in this region as well. AUTOMATIC DETECTION OF SHALLOW FAULT CREEP IN INSAR DATA (A-065) M. Wei, D. Sandwell, and J. McGuire Fault creep in Southern California mostly occurs at the shallow part of a fault with clear surface breakage. Monitoring and observing these shallow fault creep is important for regional seismic hazard assessment and improving our understanding of fault mechanics. Many fault creep occurred in remote area where no other observation instruments nearby. Even on faults with creepmeters, partial creep on sections that do not coincide with the creepmeter becomes undetectable. InSAR has been used to study fault creep in this region. However, as the volume of InSAR data has increased dramatically, over ~1000 scenes in California, and will continue to increase as future missions such as DESDynI start, searching for fault creep manually in InSAR data becomes time consuming and unrealistic. An automatic detector of fault creep in InSAR data is called for. Here, we developed an automatic detector using pattern recognition algorithm developed for road detection in SAR data to find shallow fault creep in InSAR data. The main workflow includes: process InSAR data, make gradient image of the phase image, detect linear features, and report possible fault creep. We tested this detector in Salton Trough with ERS, ENVISAT and ALOS data. Our method successfully detected most fault creep, mainly on the Superstition Hills Fault and San Andreas Fault. Limitations of the method include: prefer flat area with little sharp topography change; only be able to detect displacement larger than ~1 cm; can't detect deep fault creep. Nevertheless, this detector is a useful tool for monitoring shallow fault creep. REGIONAL BROADBAND WAVEFORM MODELING USING UPGOING AND DOWNGOING WAVE FIELDS (A-116) S. Wei and D. Helmberger 3D crustal structure usually complicates the modeling of regional waveforms. The Cut and Paste (CAP) waveform inversion method, on the other hand, is much less sensitive to velocity models and lateral crustal variation, because it breaks the waveforms into Pnl and Surface waves and inverts them separately, allowing different time shifts to align the data and the synthetics for different portions of the waveform. These time shifts represent the difference between the 1D structure and the real earth. Similar idea is applied to the upgoing and downgoing wave fields, where we use different time adjustments for upgoing and downgoing waveforms to improve the broadband waveform fits. Furthermore, different source-time-functions 250 | Southern California Earthquake Center
Poster Abstracts are adopted for upgoing and downgoing phases to take into account of the directivity effect of the source process in vertical direction. The sensitivity tests indicate that, the separation with adjustable time shifts can better fit the waveforms especially the depth phases. The improved method is applied to the 2003 Big Bear sequence to derive lateral crustal structure. CAN FAULT MAPS CONSTRAIN FUTURE EARTHQUAKE MAGNITUDES? (B-082) D.A. Weiser Can one use an existing fault map to accurately determine maximum magnitude for earthquakes in a region? It is generally assumed that fault traces constrain the location, orientation, and size of future earthquakes. Yet many earthquakes, like the M7.3, 1992 Landers, CA and M7.9, 1999 Denali, AK earthquakes, rupture beyond previousl 251 y 251 251 m 251 a 251 p 251 p 251 e 251 d 251 251 t 251 r 251 a 251 c 251 e 251 s 251 251 o 251 r 251 251 a 251 r 251 e 251 251 t 251 r 251 a 251 n 251 s 251 f 251 e 251 r 251 r 251 e 251 d 251 251 o 251 n 251 t 251 o 251 251 a 251 251 s 251 p 251 l 251 a 251 y 251 251f 251a 251u 251l 251t 251. 251 251 O 251t 251h 251e 251r 251 251 e 251v 251e 251n251t 251s 251, 251 251l251i251 k 251e 251 251t251h251e251 251M2516251.2517251,251 2511251925192514251 251N251o251r251t251h251r251i251d251g251e251,251 251C251A251,251 251t251h251e251 251M2517251.2510251 2512251025112510251 251D251a251r251f251i251e251l251d251,251 251N251e251w251 251Z251e251a251l251a251n251d251,251 251a251n251d251 251M2516251.2513251 2512251025112511251 251C251h251r251i251s251t251c251h251u251r251c251h251,251 251N251e251w251 251Z251e251a251l251a251n251d251 251 e 251 a 251 r 251 t 251 h 251 q 251 u 251 a 251 k 251 e 251 s 251 , 251 251 s 251 e 251 r 251 v 251 e 251 251 a 251 s 251 251 a 251 d 251 d 251 i 251 t 251 i 251 o 251 n 251 a 251 l 251 251 e 251 v 251 i 251 d 251 e 251 n 251 c 251 e 251 251 t 251 h 251 a 251 t 251 251l251a251r 251g251e251 251e251a251r251t251h251q 251u 251a 251k251e251s251 251c251a251n251 251a251n251d251 251d251o251 251o251c251c251u251r251 251w251h251e251r251e251 251n251o251 251f251a251u251l251t251 251h251a251d251 251b 251e 251 e 251n 251 251i 251d 251e 251n 251t 251i 251f 251 i 251e 251d 251. 251 251 251 T 251h 251i 251s251 251i251 s 251 251 i 251 m 251 p 251 o 251 r 251 t 251 a 251 n 251 t 251 251 b 251 e 251 c 251 a 251 u 251 s 251 e 251 251 r 251 e 251 g 251 r 251 e 251 s 251 s 251 i 251 o 251 n 251 s 251 251 b 251 e 251 t 251 w 251 e 251 e 251 n 251 251 m 251 a 251 g 251 n 251 i 251 t 251 u 251 d 251 e 251 251 a 251 n 251 d 251 251 r 251 u 251 p 251 t 251 u 251 r 251 e 251 251 d 251 i 251 m 251 e 251 n 251 s 251 i 251 o 251 n 251 s 251 251 a 251 r 251 e 251 251 b 251 a 251 s 251 e 251 d 251 251 o 251 n 251 251p251o251s251t251-251e251a251r251t251h251q251u251a251k251e251 251m251a251p251s251 251o251f251 251t251h251e251 251 s 251 u 251 r 251 f 251 a 251 c 251 e 251 251 r 251 u 251 p 251 t 251 u 251 r 251 e 251 251 a 251 n 251 d 251 251 i 251 n 251 s 251 t 251 r 251 u 251 m 251 e 251 n 251 t 251 a 251 l 251 251 d 251 a 251 t 251 a 251 . 251 251 T 251 h 251 e 251 s 251 e 251 251 r 251 e 251 g 251 r 251 e 251 s 251 s 251 i 251 o 251 n 251 s 251 251 a 251 r 251 e 251 251 t 251 h 251 e 251 n 251 251 e 251 m 251 p 251 l 251 o 251 y 251 e 251 d 251 251 t 251 o 251 251 e 251 s 251 t 251 i 251 m 251 a 251 t 251 e 251 251 m 251 a 251 g 251 n 251 i 251 t 251 u 251 d 251 e 251 251 o 251 f 251 251 f 251 u 251 t 251 u 251 r 251 e 251 251e251a251r251t251h251q251u251a251k251e251s251,251 251u251s251i251n251g251 251e251x251i251s251t251i251n251g251 251f251a251u251l251t251 251m251a251p251s251.251 251S251i SPATIAL DISTRIBUTIONS OF FORESHOCKS AND AFTERSHOCKS: STATIC OR DYNAMIC TRIGGERING? (B-027) M.J. Werner and A.M. Rubin In recent years, the spatial distributions of foreshocks and aftershocks have been scrutinized for evidence supporting either triggering by static stress changes induced by the permanent deformation from prior earthquakes or triggering by the dynamic stresses from seismic waves. Felzer & Brodsky (2006) identified mainshocks and triggered aftershocks, stacked the distances between these pairs and observed a single power-law decay with distance that extends beyond the zone traditionally thought to be affected by static stress changes. On this basis, they argued that dynamic stresses are responsible for triggering 251 e 251a 251r 251 t 251 h 251 q 251 u 251a 251 k 251e 251s 251. 251 251 R 251i 251c 251 h 251a 251r 251 d 251 s 251- 251 D 251 i 251 n 251 g 251 e 251 r 251 251 e 251 t 251 251 a 251 l 251 . 251 251 ( 251 2 251 0 251 1 251 0 251 ) 251 251 a 251 n 251 d 251 251 o 251 t 251 h 251 e 251 r 251 251 s 251 t 251 u 251 d 251 i 251 e 251 s 251 , 251 251 h 251 o 251 w 251 e 251 v 251 e 251 r 251 , 251 251h251a251v251e251 251p251r251e251s251e251n251t251e251d251 251s251e251v251e251r251a251l251 251l251i251n251e251s251 251 o 251 f 251 251 e 251 v 251 i 251 d 251 e 251 n 251 c 251 e 251 251 t 251 h 251 a 251 t 251 251 s 251 u 251 g 251 g 251 e 251 s 251 t 251 251 o 251 t 251 h 251 e 251 r 251 w 251 i 251 s 251 e 251 . 251 251 O 251 n 251 e 251 251 c 251 r 251 u 251 c 251 i 251 a 251 l 251 251 q 251 u 251 e 251 s 251 t 251 i 251 o 251 n 251 251 i 251 s 251 251 w 251 h 251 e 251 t 251 h 251 e 251 r 251 251 t 251 h 251 e 251 251s251t251a251c251k251e251d251 251d251i251s251t251a251n251c251e251s251 251o251f251 251p251a251i251r251s251 251 o 251 f 251 251 e 251 a 251 r 251 t 251 h 251 q 251 u 251 a 251 k 251 e 251 s 251 , 251 251 r 251 e 251 p 251 r 251 e 251 s 251 e 251 n 251 t 251 i 251 n 251 g 251 251 e 251 i 251 t 251 h 251 e 251 r 251 2011 SCEC Annual Meeting | 251
Page 1 and 2:
38˚ 36˚ 34˚ 32˚ 38˚ 36˚ 34˚
Page 3 and 4:
Table of Contents Table of Contents
Page 5 and 6:
SCEC Annual Meeting Program Sunday,
Page 7 and 8:
15:15 Introduction to the Automatic
Page 9 and 10:
Monday, September 12th 07:00 - 08:0
Page 11 and 12:
MONDAY | Meeting Program observatio
Page 13 and 14:
TUESDAY | Meeting Program evolution
Page 15 and 16:
TUESDAY | Meeting Program 17:20 Dra
Page 17 and 18:
WEDNESDAY | Meeting Program seismic
Page 19 and 20:
SCEC DIrector | Report reviews, bot
Page 21 and 22:
SCEC DIrector | Report The current
Page 23 and 24:
SCEC DIrector | Report meetings to
Page 25 and 26:
A Word of Thanks Figure 4. This "Br
Page 27 and 28:
SCEC Advisory Council | Report Afte
Page 29 and 30:
SCEC Advisory Council | Report and
Page 31 and 32:
SCEC Advisory Council | Report 3. C
Page 33 and 34:
Input and reaction to the SCEC4 Pro
Page 35 and 36:
SCEC Advisory Council | Report meet
Page 37 and 38:
Communication, Education, and Outre
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
SCEC Research Accomplishments | Rep
Page 47 and 48:
Lett., Seismological Society of Ame
Page 49 and 50:
Funning et al. resurveyed 19 GPS si
Page 51 and 52:
earthquakes. They find that plastic
Page 53 and 54:
Earthquake Geology SCEC Research Ac
Page 55 and 56:
SCEC researchers are also attemptin
Page 57 and 58:
observed waveforms (after Olsen and
Page 59 and 60:
Page 61 and 62:
urial depth, long-term tectonic str
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Figure 31. Image of the branching j
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Workshops SCEC Research Accomplishm
Page 75 and 76:
Page 77 and 78:
Local-Scale Models CDM group resear
Page 79 and 80:
Page 81 and 82:
Figure 54. CLM splitting from mantl
Page 83 and 84:
Figure 59. The short-term rates aft
Page 85 and 86:
Page 87 and 88:
esponse peaks to the incident groun
Page 89 and 90:
Page 91 and 92:
Non-Linear Structural Simulations u
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
References SCEC Research Accomplish
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Draft 2012 Science Plan SCEC Planni
Page 107 and 108:
Draft 2012 Science Plan H. Award Pr
Page 109 and 110:
B. Proposals may be strengthened by
Page 111 and 112:
Draft 2012 Science Plan 2a. Improve
Page 113 and 114:
A. Seismology Draft 2012 Science Pl
Page 115 and 116:
Draft 2012 Science Plan • Quantif
Page 117 and 118:
IX. Interdisciplinary Focus Areas D
Page 119 and 120:
Draft 2012 Science Plan E. Developm
Page 121 and 122:
Draft 2012 Science Plan objectives
Page 123 and 124:
Draft 2012 Science Plan relax segme
Page 125 and 126:
D. National Partnerships through Ea
Page 127 and 128:
A-024 VISUALIZING STRUCTURAL RESPON
Page 129 and 130:
A-137 DISCOVERING THE GEOMORPHIC RE
Page 131 and 132:
A-103 IMPACTS OF STATIC AND DYNAMIC
Page 133 and 134:
A-072 ANALYZING BUILDING RESPONSE T
Page 135 and 136:
B-147 INCORPORATING GPS VELOCITIES
Page 137 and 138:
INHIBITION OF VERY STRONG SHAKING,
Page 139 and 140:
B-030 EARTHQUAKE CLUSTERING AND AFT
Page 141 and 142:
B-127 SEISMOGRAM-BASED ASSESSMENT O
Page 143 and 144:
Poster Abstracts New paleoseismolog
Page 145 and 146:
Poster Abstracts ground motion depe
Page 147 and 148:
Poster Abstracts this delay becomes
Page 149 and 150:
Poster Abstracts time series analys
Page 151 and 152:
Poster Abstracts of a ‘weight vec
Page 153 and 154:
Perris2: .17, .16, .20, .23 Poster
Page 155 and 156:
Poster Abstracts amplitude with the
Page 157 and 158:
Poster Abstracts COMPARISON OF CO-L
Page 159 and 160:
Poster Abstracts found at other sta
Page 161 and 162:
Poster Abstracts This poster will p
Page 163 and 164:
Poster Abstracts Previous models of
Page 165 and 166:
Poster Abstracts of surface deforma
Page 167 and 168:
ADDITIONAL SHEAR RESISTANCE FROM FA
Page 169 and 170:
Poster Abstracts Seismic data were
Page 171 and 172:
Poster Abstracts providing omega-sq
Page 173 and 174:
Poster Abstracts understanding the
Page 175 and 176:
Poster Abstracts Although substanti
Page 177 and 178:
Poster Abstracts We will present th
Page 179 and 180:
E.H. Hearn, F.F. Pollitz, W.R. That
Page 181 and 182:
S. Hiemer, Q. Wang, D.D. Jackson, Y
Page 183 and 184:
Poster Abstracts STRONG GROUND MOTI
Page 185 and 186:
Poster Abstracts incorporated as ad
Page 187 and 188:
Poster Abstracts velocity model in
Page 189 and 190:
Poster Abstracts InSAR results base
Page 191 and 192:
Poster Abstracts We have observed h
Page 193 and 194:
Poster Abstracts near the rupture f
Page 195 and 196:
Poster Abstracts CRUSTAL STRUCTURE
Page 197 and 198:
Poster Abstracts volume from the RG
Page 199 and 200:
Poster Abstracts individuals (30%),
Page 201 and 202:
Poster Abstracts and Northridge Hil
Page 203 and 204: Poster Abstracts In an emergent vie
Page 205 and 206: Poster Abstracts analysis into a ge
Page 207 and 208: Poster Abstracts silts and sands. T
Page 209 and 210: Poster Abstracts Pegasus WMS provid
Page 211 and 212: Poster Abstracts THE 2011 MW 9 TOHO
Page 213 and 214: Poster Abstracts has proved to be a
Page 215 and 216: Poster Abstracts Preliminary result
Page 217 and 218: Poster Abstracts Comparison of this
Page 219 and 220: Poster Abstracts DYNAMIC RUPTURE SI
Page 221 and 222: Poster Abstracts between our two me
Page 223 and 224: Poster Abstracts 3.0 sec). In the w
Page 225 and 226: Poster Abstracts distance from past
Page 227 and 228: Poster Abstracts colonies would be
Page 229 and 230: Poster Abstracts SPACE GEODETIC INV
Page 231 and 232: Poster Abstracts and 1857. Individu
Page 233 and 234: ADVANCEMENTS IN PROBABILISTIC SEISM
Page 235 and 236: CONSTANT STRESS DROP FITS EARTHQUAK
Page 237 and 238: Poster Abstracts 233 e 233 a 233 r
Page 239 and 240: Poster Abstracts mainshock, but the
Page 241 and 242: Poster Abstracts PLATE TECTONICS: A
Page 243 and 244: Poster Abstracts THE MECHANICS OF E
Page 245 and 246: Poster Abstracts 241 C 241 a 241 l
Page 247 and 248: Poster Abstracts Geodetic and geolo
Page 249 and 250: COMPARISONS AMONG EARTHQUAKE SIMULA
Page 251 and 252: Poster Abstracts compaction of a di
Page 253: Poster Abstracts installed and tele
Page 257 and 258: Poster Abstracts safety zones for t
Page 259 and 260: Z. Xu and P. Chen Poster Abstracts
Page 261 and 262: Poster Abstracts The Whittier fault
Page 263 and 264: Poster Abstracts SAF have had a maj
Page 265 and 266: Poster Abstracts ground motions whi
Page 267 and 268: FREYMUELLER Jeffrey, U Alaska Fairb
Page 269 and 270: RUIZ Ricardo, Chaffey HS RUNDLE Joh
show all

Annual Meeting - SCEC.org

Create successful ePaper yourself

Delete template?

Save as template?