Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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S-Wave Velocities Beneath Jeju Island, Korea, Using Inversion of Receiver Functions and the H-κ Stacking Method

수신함수 역산 및 H-κ 중합법을 이용한 제주도 하부의 S파 지각 속도

  • Jeon, Taehyeon (Geological Research Division, KIGAM) ;
  • Kim, Ki Young (Department of Geophysics, Kangwon National University) ;
  • Woo, Namchul (Earthquake Detection Division, Korea Meteorological Administration)
  • 전태현 (한국지질자원연구원 국토지질연구본부) ;
  • 김기영 (강원대학교 지구물리학과) ;
  • 우남철 (기상청 지진감시과)
  • Received : 2012.12.18
  • Accepted : 2013.02.12
  • Published : 2013.02.28
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Abstract

Shear-wave velocity ($v_s$) structures beneath two seismic stations, JJU and JJB on the flanks of the volcano Halla on Jeju island, Korea, were estimated by receiver-function inversion and H-${\kappa}$ stacking applied to 150 teleseismic events ($M_W{\geq}5.5$) recorded since 2007. $P_S$ waves converted at the Moho discontinuity does not appear clearly for northwesterly back-azimuths ($207{\sim}409^{\circ}$, average $308^{\circ}$) at station JJU and southeasterly back-azimuths ($119{\sim}207^{\circ}C$, average $163^{\circ}$) at station JJB. This may be due to a gradual velocity increase at Moho or heterogeneity within the crust. The $v_s$ models derived by inversion of receiver functions indicate a distinct low velocity layer ($v_s{\leq}3.5km/s$; LVL) within the crust and a gradual increase in $v_s$ in the depth interval of 30 to 40 km. Within the radius of 18 km beneath station JJB, the LVL occurs at depths of 14 ~ 26 km and the 'Moho' ($v_s{\geq}4.3km/s$) is at 34 km depth. Ten kilometers to the west, within the radius of 16 km beneath station JJU, both the LVL and the Moho are significantly shallower, at depths of 14 to 24 km and 30 km, respectively. H-${\kappa}$ analyses for stations JJU and JJB yield estimated crustal thickness of 29 and 33 km and $v_p/v_s$ ratios of 1.64 and 1.75, respectively. The lesser $v_p/v_s$ ratio was derived for rocks nearest to th peak of the volcano.

제주도 한라산 주위에 위치한 JJU와 JJB 관측소 하부의 S파 속도구조를 규명하기 위하여, 이 관측소에서 2007년 이후 기록한 $M_W$ 5.5 이상인 원격 지진자료 중 150개 수신함수를 이용하여 역산 및 H-${\kappa}$ 중합법에 적용하였다. 모호면에서 변환된 $P_S$파는 JJU 관측소의 북서쪽(후방위각 $207{\sim}409^{\circ}$, 평균 $308^{\circ}$)과 JJB 관측소의 남동쪽(후방위각 $119{\sim}207^{\circ}$, 평균 $163^{\circ}$) 방향으로 뚜렷하지 않게 나타났다. 이것은 아마도 모호면의 점이적인 속도변화나 지각 내의 속도 불균질층 때문일 수 있다. 수신함수 역산으로부터 계산된 S파 속도모델은 지각 내의 저속도층을 뚜렷이 보여주며, 30 ~ 40 km 깊이에서 점이적으로 증가하는 양상을 보인다. JJB 관측소 반경 18 km 이내에서 저속도층($v_s{\leq}3.5km/s$)은 14 ~ 26 km에 있고, $v_s{\geq}4.3km/s$으로 정의한 '모호면'은 34 km 깊이에 있는 것으로 분석되었다. 서쪽으로 약 10 km 떨어진 곳에 위치한 JJU 관측소의 반경 16 km 이내에서는 저속도층과 '모호면'이 14 ~ 24 km와 30 km에 각각 존재하여 JJB 관측소에 비해 다소 얕은 깊이에서 나타난다. JJU와 JJB 관측소에 대한 H-${\kappa}$ 분석결과는 지각 두께가 29 km와 33 km이며, 종파/횡파 속도비($v_p/v_s$)가 1.64과 1.75임을 각각 나타내어 화산 정상에 가까운 곳에서 상대적으로 낮은 $v_p/v_s$가 관찰되었다.

Keywords

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