Study on Liquefaction Detective Method Using Strong Ground Motion Records

Miyajima, Masakatsu; Nozu, Satoru; Kitaura, Masaru; Yamamoto, Masaki

doi:10.2208/jscej.2000.647_405

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…Nakayama et al [10] presented a method, which judges about the occurrence of liquefaction either positively or negatively. Miyajima et al [11] proposed a three-level possibility method trying to distinguish some sites, where the liquefaction occurrence was questionable. Ozaki [12] introduced a simple method considering one parameter.…”

Section: Introductionmentioning

confidence: 99%

Detection of soil liquefaction from strong motion records

Kostadinov

Yamazaki

2001

Earthquake Engng. Struct. Dyn.

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During the recent earthquakes in Japan and the U.S.A. a number of records from liqueÿed-soil sites have been obtained. The ground motion parameters from these sites were studied and several methods for detection of liquefaction from seismic records were developed. The methods, however, focus mainly on the horizontal ground motion and may interpret as liquefaction-induced some records from soft-soil deposits or records with dominant surface waves, at which sites the phenomenon was not observed. Besides, not all of the available records from liqueÿed sites were processed. In this paper, after examination of the ability of di erent types of ground motion parameters to indicate alone soil liquefaction we propose a new liquefaction detection method that simultaneously analyses instantaneous frequency content of the horizontal and the vertical ground acceleration. We also compare performance of the proposed method with that of the other liquefaction detection methods. The computations are carried out using a common data set including records from liqueÿed and non-liqueÿed sites. Results show that the frequency-related parameters and the proposed method detect more e ciently the occurrence of liquefaction from the seismic records. damage assessment systems within them can predict structural damage not only due to the ground shaking, but also due to ÿre, soil liquefaction or tsunami.Since the 1964 Niigata earthquake, a number of ground motion records from liqueÿedsoil sites have been obtained. The records show that the horizontal ground acceleration alters uniquely after the onset of liquefaction -its frequency abruptly drops o to the range 0.5-1 Hz and its amplitudes decrease -while the vertical acceleration is rather stable ( Figure 1). This alteration of the horizontal acceleration is triggered by the decreasing of the soil shear modulus as a consequence of the pore-water pressure buildup under undrained condition. An adequate description of the alteration can be used as a method for detection of liquefaction from the seismic records. Such a method can operate data from a seismometer network and identify the occurrence of the phenomenon immediately after an earthquake. It can also function as a standalone liquefaction sensor in combination with an accelerometer. Liquefaction has been recognized as the main reason for collapse of earth dams and slopes, failure of foundations, superstructures and lifelines and its early detection might be of great interest.A practical approach to capture the alteration of ground motion is to calculate appropriate ground motion parameters and compare their values with limit ones that correspond to soil liquefaction. The advantages of this approach are that the alteration is expressed in terms of physically meaningful quantities and that computations are simple. The disadvantage is the incompleteness of the alteration description. Another possible approach is to perform nonlinear e ective-stress analysis of the soil. This model-based approach is more comprehensive, but involves knowledge...

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Section: Introductionmentioning

confidence: 99%

Detection of soil liquefaction from strong motion records

Kostadinov

Yamazaki

2001

Earthquake Engng. Struct. Dyn.

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“…On the other hand, attempts have been made to judge the occurrence of liquefaction from the features of earthquake acceleration waveforms observed near the points where liquefaction was ascertained, and several methods for this have been proposed [13,14]. However, they lack the property of being real time, which is indispensable for liquefaction judgment at an actual earthquake disaster.…”

Section: Necessity For Detection Of Ground Liquefactionmentioning

confidence: 99%

Earthquake Sensor

et al. 2002

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A new concept earthquake sensor was developed utilizing spectral intensity (SI) as a measurement value. The acceleration sensing part and signal conditioning part are all integrated in one body as a transducer. A real-time SI calculation algorithm was newly developed and proven by actual simulated earthquake waveforms with a three-axis exciter bench. A liquefaction judgment algorithm was also developed based on acceleration signals and integrated into the SI sensor. Thus, the first all-in-one SI sensor with liquefaction judgment was realized. With this sensor, a new earthquake disaster prevention system for gas supply, Supreme, was developed and introduced into operation around the area of Tokyo Bay, Japan.

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“…However, it is a complicated new problem. To establish an efficient method for detecting liquefaction and its effects on ground motions there are of many scholars' concerns [3,4]. The present liquefaction detection method used in Japanese SUPREME system is proposed by Suzuki [5].…”

Section: Introductionmentioning

confidence: 99%

“…The present liquefaction detection method used in Japanese SUPREME system is proposed by Suzuki [5]. Two liquefaction detection methods are proposed by Kostadinov and Yamazaki [1], Miyajima, Kitaura and Nozu [4], separately. More recently, Sun and Yuan developed a new liquefaction detection method based on frequency decreasing rates with the advantage of accurately distinguishing liquefied and diverse categories of non-liquefied sites [6,7].…”

Section: Introductionmentioning

confidence: 99%

Applying Sun-Yuan liquefaction detection method in the February 2011 Christchurch (Mw 6.3) earthquake, New Zealand

Sun¹,

Chen²,

Yuan³

2013

BNZSEE

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In April 2011, 27 processed seismic acceleration records at 27 seismic stations whose epicental distances were less than 50 km in Feb. 22 Christchurch, New Zealand earthquake (Mw6.3), were collected from GeoNet strong motion data centre. Applying Sun-Yuan liquefaction detection method on the selected records, 9 liquefied sites and 18 non-liquefied sites were blindly identified thereof in May 2011, prior to the real liquefaction reports (papers) been published. Up to present, liquefaction detection results of 11 sites, i.e., 8 liquefied sites CBGS, CCCC, CHHC, CMHS, HPSC, PRPC, REHS and SHLC and 3 non-liquefied sites PPHS, HVSC and LPCC, were confirmed by publications which were consistent with the detections. New approaches and proof (or evidence) need to be pursued to demonstrate the detected results on other sites, i.e., liquefied site LINC and 15 non-liquefied sites.

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Study on Liquefaction Detective Method Using Strong Ground Motion Records

Cited by 7 publications

References 7 publications

Detection of soil liquefaction from strong motion records

Detection of soil liquefaction from strong motion records

Earthquake Sensor

Applying Sun-Yuan liquefaction detection method in the February 2011 Christchurch (Mw 6.3) earthquake, New Zealand

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