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Published byBenjamin Simmons Modified over 8 years ago
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SEIZE Science Questions and Early Findings What controls the size of earthquakes on subduction thrusts? –What is the role of “asperities” – zones of high slips during earthquakes?
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What controls the updip and downdip limits of the seismogenic zone of subduction thrusts?
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How do stress, strain and pore fluid pressure vary through the earthquake cycle?
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Correlated OBS and fluid flow results in Costa Rica (Brown and Schwarz)
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Central America Smaller characteristic earthquakes (M~7-7.5) Temporal and spatially complex “patchy”patchy locking. with a limited slip distribution slow tsunamigenic earthquakes have occured off Nicaragua.
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Nankai Larger magnitude (M~8-8.5) earthquakes, with relatively uniform fault properties and only small lateral changes large areas are fully locked most of the time
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Connection to IODP drilling Costa Rica: two possible drilling locations proposed
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NanTroSEIZE program at IODP Stage 1: 6 non-riser (shallow) sites Stage 2: Riser: NT2-03 to 3500 m; Non-Riser: Basement and monitoring of NT1-01 and NT1-07; monitoring and 2 nd borehole at NT2-01B, conducting active hydrological test; drill NT2-04 Stage 3: Riser NT3-01; possible deepening of NT1-03 Stage 4: Final observatories and monitoring
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3D Seismic Survey April-May, 2006 M/V Nordic Explorer (PGS)
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Chikyu Shakedown Early August-Oct 2006 Primarily to test equipment International scientists on board to provide lab input, learn more about Chikyu abilities
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