INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Mwp 6.4 on date 16-08-2018 and time 20:22:57 (Italy) in region Japan [Sea]

A magnitude Mwp 6.4 earthquake occured in region: Japan [Sea], on

  • 16-08-2018 18:22:57 (UTC)
  • 16-08-2018 20:22:57 (UTC +02:00) Italian time
  • 17-08-2018 04:22:57 (UTC +10:00) local time in the region of the earthquake (Pacific/Saipan)

and geographic coordinates (lat, lon) 23.44, 143.83 at 20 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 mb 5.6
Mwp 6.4

Mwpd 6.6
2018-08-16
18:22:57
23.44 143.83 20 2018-08-16
18:57:43
Sala Sismica INGV-Roma 59817051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-16 18:22:57
Latitude 23.44
Longitude 143.83
Depth (km) 20 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 59817051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 19418
Semi-minor axis of confidence ellipse (meter) 12604
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 256
Circular confidence region, given by single value of horizontal uncertainty (meter) 15679.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107.948
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 45
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 3.65289
Epicentral distance of station closest to the epicenter (degree) 9.89463
Epicentral distance of station farthest from the epicenter (degree) 76.70612
Number of stations at which the event was observed 41
Number of stations from which data was used for origin computation 41
Magnitudes information

Mwpd:6.6

Field Value
Value 6.6
Uncertainty 0.1
Num. used stations 9
Type of magnitude Mwpd
Reference to an origin 59817051
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-08-16 18:57:43

Mwp:6.4

Field Value
Value 6.4
Uncertainty 0.2
Num. used stations 17
Type of magnitude Mwp
Reference to an origin 59817051
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-08-16 18:57:43

mb:5.6

Field Value
Value 5.6
Uncertainty 0.2
Num. used stations 29
Type of magnitude mb
Reference to an origin 59817051
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-08-16 18:57:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.COR.BHZ.00 2018-08-16T18:34:49.02 10.0 positive automatic sP 47 75.7271 1.26553 0
IU.KEV.BHZ.00 2018-08-16T18:34:44.72 10.0 positive automatic P 342 76.7061 -1.05919 0.189067
US.NLWA.BHZ.00 2018-08-16T18:34:43.15 10.0 negative automatic sP 45 74.4664 2.52109 0
US.NLWA.BHZ.00 2018-08-16T18:34:38.95 10.0 positive automatic P 45 74.4664 5.9088 0.222487
GE.KBS.BHZ.00 2018-08-16T18:34:31.37 10.0 negative automatic P 351 74.1753 0.123087 0.222944
NZ.URZ.HHZ.10 2018-08-16T18:34:00.21 10.0 negative automatic P 153 69.1439 -1.17613 0.286854
KZ.ABKAR.BHZ. 2018-08-16T18:33:55.05 10.0 positive automatic P 316 68.5821 -2.46737 0.245206
AT.CRAG.BHZ. 2018-08-16T18:33:52.64 10.0 positive automatic P 38 67.0066 5.10116 0.302817
NZ.OUZ.HHZ.10 2018-08-16T18:33:35.83 10.0 negative automatic P 153 65.0834 0.649663 0.31907
II.SIMI.BHZ.00 2018-08-16T18:33:27.65 10.0 positive automatic P 303 64.1468 -1.40522 0
US.EGAK.BHZ.00 2018-08-16T18:33:23.15 10.0 negative automatic P 28 62.5526 4.60044 0.362712
KZ.KKAR.BHZ. 2018-08-16T18:33:15.58 10.0 positive automatic P 308 62.3461 -1.62982 0.17469
II.PALK.BHZ.00 2018-08-16T18:33:15.82 10.0 positive automatic P 266 62.496 -2.37972 0.173741
II.BRVK.BHZ.00 2018-08-16T18:33:11.22 10.0 positive automatic P 319 61.6983 -1.60271 0.346221
IU.NWAO.BHZ.00 2018-08-16T18:33:08.67 10.0 positive automatic P 205 61.8014 -4.85999 0.360274
IU.COLA.BHZ.00 2018-08-16T18:33:03.00 10.0 negative automatic P 27 59.7287 4.60707 0.326006
II.AAK.BHZ.00 2018-08-16T18:32:56.62 10.0 positive automatic P 307 59.4924 -1.3853 0.374132
AU.MORW.BHZ. 2018-08-16T18:32:49.32 10.0 negative automatic P 208 58.9167 -4.46473 0.355147
II.KURK.BHZ.00 2018-08-16T18:32:34.77 10.0 positive automatic P 316 56.5313 -2.22952 0.40469
AU.GIRL.BHZ. 2018-08-16T18:32:19.47 10.0 positive automatic P 214 54.3206 -1.60474 0.502632
IU.MAKZ.BHZ.00 2018-08-16T18:32:17.62 10.0 positive automatic P 312 54.1079 -1.98715 0.42424
IN.SHL.HHZ. 2018-08-16T18:31:23.17 10.0 positive automatic P 284 47.0347 -2.92439 0.533894
MY.KUM.BHZ. 2018-08-16T18:31:09.92 10.0 positive automatic P 253 45.3382 -2.83823 0.578971
MY.IPM.BHZ. 2018-08-16T18:31:09.62 10.0 positive automatic P 252 45.3949 -3.6161 0
AU.FITZ.BHZ. 2018-08-16T18:31:06.30 10.0 positive automatic P 205 45.1723 -5.14351 0
MY.KOM.BHZ. 2018-08-16T18:31:05.67 10.0 negative automatic P 247 44.3426 0.846145 0
IU.CTAO.BHZ.00 2018-08-16T18:30:54.32 10.0 positive automatic P 177 43.5857 -4.47915 0
IU.YAK.BHZ.00 2018-08-16T18:30:25.27 10.0 positive automatic P 350 39.7774 -2.30403 0.618955
MY.LDM.BHZ. 2018-08-16T18:29:12.02 10.0 positive automatic P 237 30.478 4.45592 0.92028
GE.SANI.BHZ. 2018-08-16T18:29:05.17 10.0 negative automatic P 217 30.8373 -5.54288 0.769528
IU.INCN.BHZ.00 2018-08-16T18:27:31.02 10.0 negative automatic P 318 20.3563 -0.212823 0.930233
JP.YOJ.BHZ. 2018-08-16T18:27:19.70 10.0 negative automatic P 277 19.0329 2.91889 0.952381
JP.JTM.BHZ. 2018-08-16T18:26:59.45 10.0 positive automatic pP 353 17.508 0.487135 0
JP.JTU.BHZ. 2018-08-16T18:26:50.00 10.0 negative automatic P 315 16.7697 0.279718 0.930233
JP.JNU.BHZ. 2018-08-16T18:26:31.50 10.0 negative automatic P 313 14.9411 5.33763 0.952381
JP.JOW.BHZ. 2018-08-16T18:26:22.50 10.0 negative automatic P 287 14.4751 2.73401 0.888889
JP.JMM.BHZ. 2018-08-16T18:26:20.65 10.0 positive automatic P 350 14.6653 -1.6924 0
JP.JMN.BHZ. 2018-08-16T18:26:05.40 10.0 positive automatic P 322 13.4878 -0.955542 0.909091
JP.JGF.BHZ. 2018-08-16T18:26:03.25 10.0 negative automatic P 337 13.3996 -1.91087 0.909091
G.INU.BHZ.00 2018-08-16T18:26:00.56 10.0 positive automatic P 335 13.2957 -3.09949 0.888889
JP.JSG.BHZ. 2018-08-16T18:25:51.00 10.0 positive automatic P 338 12.2707 1.34733 0
IU.GUMO.BHZ.00 2018-08-16T18:25:22.47 10.0 negative automatic P 174 9.8946 5.31966 0.43956
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download