Keiiti Aki

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Keiiti Aki is affiliated with the following schools: California Institute of Technology, University of Tokyo, University of Southern California, Massachusetts Institute of Technology

Keiiti Aki's AcademicInfluence.com Rankings

Keiiti Aki

Earth Sciences

#21

World Rank

#82

Historical Rank

Geophysics

World Rank

#12

Historical Rank

earth-sciences Degrees

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Earth Sciences

Keiiti Aki's Degrees

Bachelors Physics University of Tokyo

Why Is Keiiti Aki Influential?

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According to Wikipedia, Keiiti Aki was a Japanese-American professor of Geophysics at the Massachusetts Institute of Technology , and then at the University of Southern California , seismologist, author and mentor. He and Paul G. Richards coauthored "Quantitative Seismology: theory and methods".

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Keiiti Aki's Published Works

Number of citations in a given year to any of this author's works

Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author

Published Works

Quantitative Seismology: Theory and Methods (1980) (5205)
Origin of coda waves: Source, attenuation, and scattering effects (1975) (1553)
Quantitative Seismology, 2nd Ed. (2002) (1128)
Scaling law of seismic spectrum (1967) (1095)
Space and Time Spectra of Stationary Stochastic Waves, with Special Reference to Microtremors (1957) (1031)
Analysis of the seismic coda of local earthquakes as scattered waves (1969) (913)
Determination of the three‐dimensional seismic structure of the lithosphere (1977) (862)
Determination of three‐dimensional velocity anomalies under a seismic array using first P arrival times from local earthquakes: 1. A homogeneous initial model (1976) (696)
A specific barrier model for the quantitative description of inhomogeneous faulting and the prediction of strong ground motion. I. Description of the model (1983) (617)
Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25 Hz (1980) (552)
Characterization of barriers on an earthquake fault (1979) (544)
Fault plane with barriers: A versatile earthquake model (1977) (514)
Discrete wave-number representation of seismic-source wave fields (1977) (503)
Generation and Propagation of G Waves from the Niigata Earthquake of June 16, 1964. : Part 2. Estimation of earthquake moment, released energy, and stress-strain drop from the G wave spectrum. (1966) (468)
Scattering and attenuation of shear waves in the lithosphere (1980) (447)
Fractal geometry in the San Andreas Fault System (1987) (415)
Surface motion of a layered medium having an irregular interface due to incident plane SH waves (1970) (405)
A numerical study of two-dimensional spontaneous rupture propagation (1977) (381)
Source mechanism of volcanic tremor: fluid-driven crack models and their application to the 1963 kilauea eruption (1977) (353)
Asperities, barriers, characteristic earthquakes and strong motion prediction (1984) (343)
Seismic displacements near a fault (1968) (330)
Site amplification of coda waves from local earthquakes in central California (1986) (321)
Scattering characteristics of elastic waves by an elastic heterogeneity (1985) (320)
A study on the response of a soft basin for incident S, P, and Rayleigh waves with special reference to the long duration observed in Mexico City (1989) (312)
Deep volcanic tremor and magma ascent mechanism under Kilauea, Hawaii (1981) (259)
Simultaneous study of the source, path, and site effects on strong ground motion during the 1989 Loma Prieta earthquake: A preliminary result on pervasive nonlinear site effects (1991) (253)
Local site effects on weak and strong ground motion (1993) (249)
Scattering wave energy propagation in a random isotropic scattering medium: 1. Theory (1991) (248)
Scattering of P waves under the Montana Lasa (1973) (238)
A comparative study of scattering, intrinsic, and coda Q−1 for Hawaii, Long Valley, and central California between 1.5 and 15.0 Hz (1992) (234)
Spatial and temporal correlation between coda Q and seismicity in China (1988) (214)
Slow waves trapped in a fluid‐filled infinite crack: Implication for volcanic tremor (1987) (207)
Local Site Effects on Strong Ground Motion (1988) (203)
Seismic guided waves trapped in the fault zone of the Landers (1994) (200)
Seismic Trapped Modes in the Oroville and San Andreas Fault Zones (1990) (199)
Elastic wave scattering by a random medium and the small‐scale inhomogeneities in the lithosphere (1985) (197)
Scaling Law of Earthquake Source Time-Function (1972) (190)
Location of seismic events and eruptive fissures on the Piton de la Fournaise volcano using seismic amplitudes (2003) (176)
Simultaneous determination of the seismic moment and attenuation of seismic surface waves (1969) (175)
Magnitude‐frequency relation for small earthquakes: A clue to the origin of ƒmax of large earthquakes (1987) (174)
A Probabilistic Synthesis of Precursory Phenomena (2013) (164)
Comparison of the effects between single and multiple scattering on coda waves for local earthquakes (1983) (162)
Precise focal depth determination from amplitude spectra of surface waves (1970) (162)
Pre-eruptive migration of earthquakes at the Piton de la Fournaise volcano (Réunion Island) (2005) (157)
Topography effect at the critical SV-wave incidence: Possible explanation of damage pattern by the Whittier Narrows, California, earthquake of 1 October 1987 (1990) (155)
Introduction: Seismic wave scattering in three-dimensionally heterogeneous earth (1988) (148)
Seismic radiation from an SH line source in a laterally heterogeneous planar fault zone (1990) (148)
Temporal change in coda Q before the Tangshan Earthquake of 1976 and the Haicheng Earthquake of 1975 (1986) (146)
A NOTE ON THE USE OF MICROSEISMS IN DETERMINING THE SHALLOW STRUCTURES OF THE EARTH’S CRUST (1965) (146)
Multiple scattering and energy transfer of seismic waves—Separation of scattering effect from intrinsic attenuation II. Application of the theory to Hindu Kush region (1988) (143)
Strain, tilt, and rotation associated with strong ground motion in the vicinity of earthquake faults (1982) (139)
Erratum: ``Seismic monitoring and modeling of an active volcano for prediction'' (2000) (131)
Characteristics of seismic waves composing Hawaiian volcanic tremor and gas-piston events observed by a near-source array (1991) (129)
Three-dimensional seismic structure of the lithosphere under Montana Lasa (1976) (124)
Regional variation of the scaling law of earthquake source spectra (1978) (120)
3-D inhomogeneities in the upper mantle (1981) (117)
Strong Motion Seismology (1987) (112)
A precise, continuous measurement of seismic velocity for monitoring in situ stress (1974) (104)
Observation and modelling of fault‐zone fracture seismic anisotropy ‐ I. P, SV and SH travel times (1987) (98)
The fractal nature of the inhomogeneities in the lithosphere evidenced from seismic wave scattering (1985) (97)
Scattering and attenuation (1982) (97)
The two‐dimensional Gaussian beam synthetic method: Testing and application (1984) (94)
Mapping of the high-frequency source radiation for the Loma Prieta Earthquake, California (1993) (94)
Evidence for magma intrusion during the Mammoth Lakes Earthquakes of May 1980 and implications of the absence of volcanic (harmonic) tremor (1984) (92)
Focal depth and mechanism of mid‐ocean ridge earthquakes (1973) (92)
Scattering conversions P to S versus S to P (1992) (92)
Separation of intrinsic and scattering attenuation in southern California using TERRAscope data (1994) (90)
Fault-zone guided waves from explosions in the San Andreas fault at Parkfield and Cienega Valley, California (1997) (90)
Some Problems in Statistical Seismology (1956) (89)
Three-Dimensional Seismic Imaging (1987) (89)
Comparison of two independent methods for the solution of wave-scattering problems: Response of a sedimentary basin to vertically incident SH waves (1971) (87)
Depth-dependent structure of the Landers fault zone from trapped waves generated by aftershocks (2000) (84)
Mechanism of Love‐Wave excitation by explosive sources (1972) (83)
Theory of Earthquake Prediction with Special Reference to Monitoring of the Quality Factor of Lithosphere by the Coda Method (1985) (82)
Site amplification from coda waves: Validation and application to S-wave site response (1995) (81)
Multiple scattering ofSH waves in 2-D media with many cavities (1992) (78)
Interpretation of seismic data from hydraulic fracturing experiments at the Fenton Hill, New Mexico, hot dry rock geothermal site (1982) (75)
Study of earthquake mechanism by a method of phase equalization applied to Rayleigh and Love waves (1960) (74)
Solid earth tide and observed change in the in situ seismic velocity (1973) (74)
Amplitude spectra of surface waves from small earthquakes and underground nuclear explosions (1971) (73)
Amplitude and phase data inversions for phase velocity anomalies in the Pacific Ocean basin (1987) (72)
Seismicity simulation with a rate- and state-dependent friction law (1986) (72)
The relation between site amplification factor and surficial geology in central California (1992) (69)
A delineation of the Nojima fault ruptured in the M7.2 Kobe, Japan, earthquake of 1995 using fault zone trapped waves (1998) (69)
Seismological evidences for the existence of soft thin layers in the upper mantle under Japan (1968) (69)
Seismicity simulation with a mass-spring model and a displacement hardening-softening friction law (1984) (66)
What is the Southern California Earthquake Center (1991) (66)
Location of tremor sources and estimation of lava output using tremor source amplitude on the Piton de la Fournaise volcano: 1. Location of tremor sources (2005) (65)
Quantitative analysis of long‐period events recorded during hydrofracture experiments at Fenton Hill, New Mexico (1990) (63)
Site amplification from S-wave coda in the Long Valley caldera region, California (1991) (63)
Generation and Propagation of G Waves from the Niigata Earthquake of June 16, 1964 : Part 1. A statistical analysis. (1966) (63)
Source and scatering effects on the spectra of small local earthquakes (1981) (63)
Temporal change in coda associated with the Round Valley, California, Earthquake of November 23, 1984 (1987) (60)
Numerical study of diffraction of plane elastic waves by a finite crack with application to location of a magma lens (1978) (60)
Seismic properties of a shallow magma reservoir in Kilauea Iki by active and passive experiments (1976) (59)
Waveform synthesis of surface waves in a laterally heterogeneous Earth by the Gaussian Beam Method (1985) (59)
Seismic source function for an underground nuclear explosion : 10F, 3T, 48R Seismol. Soc. Amer. Bull. V64, N1, Feb. 1974, P131–148 (1974) (59)
Bias in the estimate of seismic moment tensor by the linear inversion method (1979) (58)
Source mechanism of the Truckee, California, earthquake of September 12 1966 (1970) (57)
High-resolution maps of Coda Q in Japan and their interpretation by the brittle-ductile interaction hypothesis (2005) (57)
Near-field and far-field seismic evidences for triggering of an earthquake by the Benham explosion (1969) (54)
Sealing law of far-field spectra based on observed parameters of the specific barrier model (1985) (53)
Location of tremor sources and estimation of lava output using tremor source amplitude on the Piton de la Fournaise volcano: 2. Estimation of lava output (2005) (52)
Determination of seismic moment tensor using surface waves (1978) (51)
Seismic source time function of propagating longitudinal‐shear cracks (1972) (50)
Higher-order interrelations between seismogenic structures and earthquake processes (1992) (49)
3-D simulations of surface wave propagation in the Kanto sedimentary basin, Japan Part 2: Application of the surface wave BEM (1993) (49)
Characteristics of coda waves: Central and southcentral Alaska (1984) (49)
Three‐dimensional seismic inhomogeneities in the lithosphere and asthenosphere: Evidence for decoupling in the lithosphere and flow in the asthenosphere (1982) (48)
Regional change of coda Q in the oceanic lithosphere (1985) (47)
Determination of local phase velocity by intercomparison of seismograms from strain and pendulum instruments (1964) (44)
Scale dependence in earthquake phenomena and its relevance to earthquake prediction. (1996) (42)
A preliminary study of coda Q in California and Nevada (1986) (42)
Shallow structure of the Landers Fault Zone from explosion-generated trapped waves (1999) (41)
Spectral splitting of toroidal‐free oscillations due to lateral heterogeneity of the Earth's structure (1972) (40)
Seismic albedo from the total seismic energy dependence on hypocentral distance in southern California (1991) (40)
Earthquake Generating Stress in Japan for the Years 1961 to 1963 Obtained by Smoothing the First Motion Radiation Patterns (1966) (39)
Attenuation and Scattering of Short-Period Seismic Waves in the Lithosphere (1981) (39)
Effect of slip rate on stress drop (1986) (38)
Phase Velocity of Low Waves in Japan (Part 1) : Love Waves from the Aleutian Shock of March 9, 1957 (1963) (38)
Three-dimensional velocity structure beneath the Kanto district, Japan. (1982) (38)
Preliminary Results on the 3-dimensional Seismic Structure of the Lithosphere under the USGS Central California Seismic Array (1976) (36)
Site amplification factors in central and Southern California determined from coda waves (1995) (36)
San Jacinto Fault Zone guided waves: A discrimination for recently active fault strands near Anza, California (1997) (35)
Temporal and spatial variation on codaQ−1 associated with the North Palm Springs earthquake of July 8, 1986 (1990) (35)
Ideal probabilistic earthquake prediction (1989) (34)
A two-dimensional moving dislocation model for a strike-slip fault (1971) (34)
Observation and modelling of fault-zone fracture seismic anisotropy — II. P-wave polarization anomalies (1987) (33)
Scattering and attenuation of high-frequency body waves (1–25 Hz) in the lithosphere (1981) (32)
Use of the Function sin x/x in Gravity Problems (1955) (32)
Earthquake prediction, societal implications (1995) (31)
Preliminary Results from a Field Experiment on Volcanic Events at Kilauea Using an Array of Digital Seismographs (1992) (31)
Frequency-dependent site amplification factors using the S-wave coda for the island of Hawaii (1992) (31)
A note on surface waves from the hardhat nuclear explosion (1964) (30)
Interpretation of source functions of circum‐Pacific earthquakes obtained from long‐period Rayleigh waves (1960) (29)
Source mechanism of the deep Colombian earthquake of 1970 July 31 from the free oscillation data (1978) (29)
The use of Love waves for the study of earthquake mechanism (1960) (28)
Scattering and anelastic attenuation of seismic energy in central and south-central Alaska (1991) (27)
A LOW-VELOCITY ZONE IN THE BASEMENT BENEATH THE VALLES CALDERA, NEW MEXICO (1991) (27)
Tilt signals derived from a GEOSCOPE VBB Station on the Piton de la Fournaise Volcano (2000) (26)
3-D simulations of surface wave propagation in the Kanto sedimentary basin, Japan—part 1: Application of the surface wave Gaussian beam method (1993) (26)
Strong motion prediction using mathematical modeling techniques (1982) (25)
Comparison of Mount Etna, Kilauea, and Piton de la Fournaise by a quantitative modeling of their eruption histories (2001) (24)
A new view of earthquake and volcano precursors (2004) (24)
Possibilities of seismology in the 1980's (1980) (23)
Correlogram Analyses of Seismograms by Means of a Simple Automatic Computer. (1956) (23)
Simulation of long-period, near-field motion for the great California earthquake of 1857 (1980) (21)
Seismological evidence for the brittle-ductile interaction hypothesis on earthquake loading (2004) (21)
Scale-dependence in Earthquake Processes and Seismogenic Structures (2000) (20)
Source inversion of the 1987 Whittier Narrows earthquake, California, using the isochron method (1993) (20)
An active experiment with earthquake fault for an estimation of the in situ stress (1970) (20)
State of the Art in Volcanic Seismology (1992) (20)
Temporal correlation between coda Q -1 and seismicity—evidence for a structural unit in the brittle-ductile transition zone (1993) (20)
Boundary integral‐Gaussian beam method for seismic wave scattering: SH waves in two‐dimensional media (1989) (19)
Correlational Study of Near Earthquake Waves (1959) (19)
Study of Love and Rayleigh waves from earthquakes with fault plane solutions or with known faulting. Part 1. A phase difference method based on a new model of earthquake source (1964) (18)
Further study of the mechanism of circum‐Pacific earthquakes from Rayleigh waves (1960) (18)
Scaling law of earthquake source time-function : GEOPHYS. J. ROY. ASTRON. SOC. V1, N1–3, 1972, P3–25 (1974) (18)
Summary of discussions on coda waves at the Istanbul IASPEI meeting (1991) (17)
Crustal Structure in Japan from the Phase Velocity of Rayleigh Waves : Part 2. Rayleigh Waves from the Aleutian Shock of March 9, 1957 (1963) (16)
Spectral Study of Near Earthquake Waves (1) (1958) (16)
Ground motion at mountains and sedimentary basins with vertical seismic velocity gradient (1994) (15)
General coherence functions for amplitude and phase fluctuations in a randomly heterogeneous medium (1991) (15)
Interrelation between fault zone structures and earthquake processes (1995) (15)
Coda Q in two-layer random media (1997) (14)
A perspective on the history of Strong Motion Seismology (2003) (14)
Assigning probability gain for precursors of four large Chinese earthquakes (1983) (14)
Data summary for dense GEOS array observations of seismic activity associated with magma transport at Kilauea Volcano, Hawaii (1989) (13)
Iterative inversion for velocity using waveform data (1986) (13)
Aspects of the mechanics of earthquake rupture related to the generation of high frequency waves and the prediction of strong ground motion (1982) (13)
Appendix 1 – Glossary of Interest to Earthquake and Engineering Seismologists (2003) (13)
Ray series modeling of seismic wave travel times and amplitudes in three‐dimensional heterogeneous anisotropic crystalline rock: Borehole vertical seismic profiling seismograms from the Mojave Desert, California (1990) (13)
Study of Love and Rayleigh waves from earthquakes with fault plane solutions or with known faulting Part 2. Application of the phase difference method (1964) (12)
Quantitative prediction of strong motion for a potential earthquake fault (2010) (12)
Accuracy of the Rayleigh Wave Method for Studying the Earthquake Mechanism (1962) (11)
8. Crustal Structure in Japan from the Phase Velocity of Rayleigh Waves : Part 1. Use of the network of seismological stations operated by the Japan Meteorological Agency (1961) (10)
3. Accuracy of Origin Time, Epicentre and Focal Depth of Local Earthquake Determined Routinely by the Japan Meteorological Agency (1965) (10)
Scattering and attenuation of seismic waves, Part 3 (1999) (10)
Scattering and Attenuations of Seismic Waves, Part I (1988) (9)
Recent results on the mechanism of earthquakes with implications for the prediction and control program (1972) (8)
Comment on “Microearthquake spectra from the Anza, California, seismic network: Site response and source scaling,” by A. Frankel and L. Wennerberg (1990) (7)
Attenuation due to partial melting: An experimental study on a model system, using the Lab Coda Method (1993) (7)
A shallow attenuating anomaly inside the ring fracture of the Valles Caldera, New Mexico (1995) (7)
Synthesis of teleseismic P waves from sources near sinking lithospheric slabs (1975) (6)
Seismicity and seismological method (1968) (6)
Effect of finite thickness of scattering layer on coda Q of local earthquakes (1996) (6)
An effective approach to determine the dynamic source parameters (1996) (6)
Physical Basis for the Duration Magnitude and Recommended Practice for Coda Magnitude Determination (1983) (6)
Impact of earthquake seismology on the geological community since the Benioff zone (1988) (5)
Three-dimensional seismic velocity anomalies and their relation to local seismicity (1979) (5)
Revision of some results obtained in the study of the source function of Rayleigh waves (1962) (4)
Three-dimensional vector-wave field imaging of seismic sources in arbitrarily anisotropic and heterogeneous elastic media (1986) (4)
Thermal Process Near the Earth's Crust (1956) (4)
Economical seismogram synthesis using causality with FFT (1989) (4)
Correction to “Seismic monitoring and modeling of an active volcano for prediction” by Keiiti Aki and Valérie Ferrazzini (2000) (4)
Automatic computation of impulse response seismograms of Rayleigh waves for mixed paths (1961) (4)
Discriminating Underground Explosions from Earthquakes Using Seismic Coda Waves. (1995) (3)
Reply [to “Comments on some papers concerning amplitudes of seismic surface waves”] (1972) (3)
Short period seismology (1984) (3)
The use of long-period surface waves in the study of earthquake mechanism (1961) (3)
Quantitative Prediction of Earthquake Occurrence as Stochastic Phemomena (1954) (3)
Progress report on the determination of seismic moment tensor from long-period surface waves (1982) (2)
Progress in Japanese earthquake prediction research (1978) (2)
Seismic Coda Waves: A Stochastic Process in Earth’s Lithosphere (1997) (2)
5 - Synthesis of Earthquake Science Information and Its Public Transfer: A History of the Southern California Earthquake Center (2002) (2)
Mechanics Problems in Geodynamics Part II (1995) (2)
Correlogram Analysis of Seismograms (1955) (2)
SURFACE WAVE RAY TRACING AND MS:YIELD DETERMINATION IN A LATERALLY HETEROGENEOUS EARTH (1989) (2)
Seismic foci in the far east (1974) (1)
The Use of Coda Waves for Characterizing the Site Effect on Strong Ground Motion (1994) (1)
Correlation between coefficients determined by the least squares method (1961) (1)
First award of the Medal of the Seismological Society of America (1976) (1)
A Note on Crustal Structure (1962) (1)
Symposium links geophysical structure and process (1991) (1)
Study of Love and Rayleigh waves from earthquakes with fault plane solutions or with known faulting Part 3. Table of source phase differences between Rayleigh and Love waves (1964) (1)
Aki receives 2004 William Bowie Medal (2005) (1)
Study of earthquake sources from the seismic spectrum (1969) (1)
Mapping a magma reservoir by locating thermal cracks (1977) (1)
Relay Computer for Correlogram Analysis (1955) (1)
Introduction to the workshop on quantification of earthquakes (1978) (1)
Correction to “Seismic guided waves trapped in the fault zone of the Landers, California, earthquake of 1992” by Yong‐Gang Li, Keiiti Aki, David Adams, Akiko Hasemi and William H. K. Lee (1994) (1)
Research in Seismology (Attenuation and Source Mechanisms) (1980) (1)
Automatic Computer of Correlation Coefficient between Signals sent from two Seismometers by the use of Decatron Counting Tube (1956) (1)
Modelling elastic media with the wavelet transform (2001) (1)
24. A Digital, Tele-recorded, Long-Period Seismograph System (1965) (1)
Imaging the shape of an elastic heterogeneity by the T-matrix method (1993) (1)
POST-DOCTORAL PROGRAM IN SEISMOLOGY (1969) (0)
The source phases Ca and eL of Rayleigh and Love waves as defined in equation (2005) (0)
Magnetic Recording Seismometer by Means of Moving Magnet (1952) (0)
Analyzing probabilistic Seismic Hazard Analysis (1994) (0)
Research in seismology. Annual report, 1 April 1973--31 March 1974 (1973) (0)
Development of a quantitative model of stress in a seismic region as a basis for earthquake prediction (1981) (0)
Proceedings of Workshop XXXVII; a workshop on Physical and observational basis for intermediate-term earthquake prediction (1987) (0)
Thermal Processes near the Earth's Crust: ―松沢の“場の論”に含まれる熱過程をめぐつて― (1954) (0)
Modelling Elastic Media With Arbitrary Shapes Using the Wavelet Transform (2004) (0)
Effects of heterogeneities on the propagation, scattering and attenuation of seismic waves and the characterization of seismic source. Final report, 1 December 1982-30 November 1985 (1985) (0)
Correction to “San Jacinto Fault Zone guided waves: A discrimination for recently active fault strands near Anza, California” by Yong‐Gang Li, Frank L. Vernon, and Keiiti Aki (1997) (0)
How to make the Zero-length-spring (1965) (0)
2. A Computer Program for Precise Determination of Focal Mechanism of Local Earthquakes by Revising Focal Depths and Orust-Mantle Structure (1965) (0)
Study of New England Seismicity with emphasis on Massachusetts and New Hampshire (1980) (0)
Effects of Lateral Heterogeneities on the Propagation, Scattering, and Attenuation of the Seismic Waves and the Characterization of the Seismic Source (1983) (0)
RESEARCH IN SEISMOLOGY. (1978) (0)
Group Velocity of Rayleigh Waves with Periods 20 to 35 sec in Japan (1961) (0)
Haskell's Source Mechanism Papers and their Impact on Modern Seismology (2013) (0)
1983 James B. Macelwane Awards: Thomas H. Jordan (1983) (0)
Seismic Motion , Lithospheric Structures , Earthquake and Volcanic Sources : The (2002) (0)
Frequency Analysis of Local Tremors of the Ground by means of a Magnetic Microseismic Spectrometer (1952) (0)
Nature of Upper Mantle in Japan (1964) (0)
Seismic Source Mechanisms (1971) (0)
Use of coda waves for the study of microearthquake source mechanism (1969) (0)

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