The 27jul2022 M7.0 Northwestern Luzon Earthquake - Poster - Ao - 06aug2022 - v3.png
The 27jul2022 M7.0 Northwestern Luzon Earthquake - Poster - Ao - 06aug2022 - v3.png
The 27jul2022 M7.0 Northwestern Luzon Earthquake - Poster - Ao - 06aug2022 - v3.png
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NORTHWESTERN LUZON EARTHQUAKE
SUMMARY FOCAL MECHANISM
At 08:43 AM Philippine Standard Time (PST), 27 July 2022, a major earthquake with magnitude (M w) 7.0 shook the provinces in northwestern Luzon and adjacent areas The SWIFT-Centroid Moment Tensor Solution shows that the
including Metro Manila. The earthquake has an epicenter located at 17.63°N, 120.63°E – 3 km N 50° W of Tayum (Abra) with a depth of 15 kilometers. The ground shaking was earthquake was generated by a reverse left-lateral oblique fault.
felt at PHIVOLCS Earthquake Intensity Scale (PEIS) VII (destructive) in Abra and as far as Camarines Sur at PEIS I (scarcely perceptible). Based on the location and focal
SWIFT Centroid Moment Tensor Solution
mechanism, the earthquake was generated by the Abra River Fault with an oblique slip. The National Disaster Risk Reduction and Management Council (NDRRMC) reports
that the earthquake caused 11 deaths, 574 injured and approximately Php 1.6 billion worth of damages to infrastructure and agriculture (NDRRMC SitRep 12, 7 August 2022).
The DOST-PHIVOLCS Quick Response Team (QRT) was immediately deployed on the same day as the earthquake to: 1) conduct earthquake information, education and
communication activities to local government units (LGUs) and local residents in the affected areas; 2) assess and map the earthquake’s geologic impacts and effects to
structures; 3) deploy temporary seismic stations for continuous aftershocks monitoring; 4) conduct intensity assessment; and 5) assist the LGUs in assessing selected Moment magnitude (Mw) = 7.0
evacuation/relocation sites in terms of earthquake hazards. Seismic moment (M0) = 4.01 x 1019 Nm
Benguet. Liquefaction occurred along the coastal areas in Ilocos Sur and in the river channels in Abra and Ilocos Sur. Sea level disturbance was also observed in some coastal Date: 2022/07/27 00:43 UTC
Analysis: Manual (Rapid solution)
areas of Ilocos Sur and La Union.
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EARTHQUAKE IMPACTS
Damages to buildings and infrastructures Liquefaction impacts
H
F R
C
E G
A. A completely damaged and collapsed concrete hollow block B. A church in Vigan City, Ilocos Sur sustained extensive damage B L I. Lateral spreads formed along the banks of Candon River in Sitio J. In Brgy. Puro, Caoayan, Ilocos Sur, a two-story house sank by 45
(CHB) house in Brgy. Layugan, Bucay, Abra. where patches of the unreinforced brick masonry wall fell. M Pantar, Brgy. Tamurong Segundo, Candon City, Ilocos Sur. cm due to liquefaction.
J A
K D
Q
I
C. A moderately damaged reinforced concrete house with a D. A school building in Brgy. Dugong, Bucay, Abra sustained heavy K. An orthophoto (derived using remotely piloted aircraft) of the coast of Brgy. Rancho, Santa, Ilocos Sur shows lateral spreads
collapsed top front wall in Brgy. Lipcan, Bangued, Abra. damage such as exposed columns and large wall spalling. extending for approximately 300 meters. Sand boils also appeared in some of the ground fissures.
E. A hotel made of unreinforced brick masonry in Brgy. II, Vigan F. A government building in Bangued, Abra sustained extensive O L. Sand fissures were observed in an open field in Brgy. Lipcan, M. Sand boils formed on a beach in Brgy. Mindoro, Vigan City,
City, Ilocos Sur sustained slight damages along its walls. damage -- large cracks and spalling on walls were observed. Bangued, Abra. Ilocos Sur.
Sea level disturbance
T
G. A completely damaged and collapsed reinforced concrete H. A church in Tayum, Abra suffered heavy damage – spalling of N. In Brgy. Darigayos, Luna, La Union, waves from the localized O. A resident of Brgy. Darigayos, Luna, La Union was interviewed
house in Brgy. Lipcan, Bangued, Abra. reinforced concrete bell tower was observed. sea level disturbance displaced boats docked by the shore. regarding the localized sea level disturbance observed in the area.
Earthquake-induced landslides
P. Extensive tension cracks traversing the road and hillside in Brgy. Q. Landslides blocked a provincial road along the Madalipay-Santo R. A progressing landslide at Sitio Amianan, Brgy. Tologtog, Dolores Abra. The yellow dashed line S. Rock fall blocked the provincial road in Brgy. Nagparan, T. The barangay road in Brgy. Nagyubuyuban, San Fernando, La
Sabtan-olo, San Isidro, Abra. Tomas boundary, in Bucay, Abra. shows the extent of the possible landslide mass. Danglas, Abra. Union was damaged due to landslide and tension cracks.
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PHILIPPINE INSTITUTE OF VOLCANOLOGY AND SEISMOLOGY Website: www.phivolcs.dost.gov.ph; Facebook: www.facebook.com/PHIVOLCS/; Twitter: @phivolcs_dost
PHIVOLCS Building. C.P. Garcia Avenue, U.P. Campus, Diliman, 1101 Quezon City, Philippines 27 JULY 2022 MAGNITUDE 7.0 NORTHWESTERN LUZON EARTHQUAKE Quick Response Team
7 August 2022