INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Mwp 6.0 on date 18-09-2018 and time 09:27:41 (Italy) in region Southwest Indian Ridge [Sea]

A magnitude Mwp 6.0 earthquake occured in region: Southwest Indian Ridge [Sea], on

  • 18-09-2018 07:27:41 (UTC)
  • 18-09-2018 09:27:41 (UTC +02:00) Italian time
  • 18-09-2018 11:27:41 (UTC +04:00) local time in the region of the earthquake (Indian/Reunion)

and geographic coordinates (lat, lon) -37.6, 49.79 at 1 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 5.3
Mwp 6.0

Mwpd 6.1
2018-09-18
07:27:41
-37.6 49.79 1 2018-09-18
07:55:00
Sala Sismica INGV-Roma 61060241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-09-18 07:27:41
Latitude -37.60
Longitude 49.79
Depth (km) 1 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 61060241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 16943
Semi-minor axis of confidence ellipse (meter) 11987
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 58
Circular confidence region, given by single value of horizontal uncertainty (meter) 13703.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76.0685
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 55
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.48288
Epicentral distance of station closest to the epicenter (degree) 8.96587
Epicentral distance of station farthest from the epicenter (degree) 99.49092
Number of stations at which the event was observed 52
Number of stations from which data was used for origin computation 52
Magnitudes information

Mwpd:6.1

Field Value
Value 6.1
Uncertainty 0.1
Num. used stations 10
Type of magnitude Mwpd
Reference to an origin 61060241
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-09-18 07:55:00

Mwp:6

Field Value
Value 6
Uncertainty 0.1
Num. used stations 13
Type of magnitude Mwp
Reference to an origin 61060241
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-09-18 07:55:00

mb:5.3

Field Value
Value 5.3
Uncertainty 0.1
Num. used stations 39
Type of magnitude mb
Reference to an origin 61060241
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-09-18 07:55:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IU.ULN.BHZ.00 2018-09-18T07:41:22.92 10.0 positive automatic P 35 99.4909 -1.27504 0
PL.KSP.BHZ. 2018-09-18T07:40:54.82 10.0 positive automatic P 340 93.1977 -0.599283 0.0717928
OE.KBA.BHZ. 2018-09-18T07:40:43.62 10.0 positive automatic P 336 90.7245 -0.586986 0.0871453
RD.MTLF.BHZ. 2018-09-18T07:40:48.10 10.0 negative automatic P 328 91.7129 -0.459407 0.0812091
IU.PAB.BHZ.00 2018-09-18T07:40:48.22 10.0 negative automatic P 321 91.7443 -0.585474 0.0806345
OE.ARSA.BHZ. 2018-09-18T07:40:41.02 10.0 negative automatic P 338 90.1983 -0.539675 0.0927602
C1.BO02.BHZ. 2018-09-18T07:40:36.05 10.0 positive automatic P 225 89.0119 -0.0121438 0.0975134
KZ.ABKAR.BHZ. 2018-09-18T07:40:26.48 10.0 positive automatic P 7 87.3127 -1.41632 0.113402
GT.CPUP.BHZ.00 2018-09-18T07:40:24.20 10.0 positive automatic P 239 86.4673 0.471286 0.118431
C.GO06.BHZ. 2018-09-18T07:40:20.38 10.0 negative automatic P 221 85.8754 -0.626766 0.118798
MN.VSL.BHZ. 2018-09-18T07:40:19.57 10.0 positive automatic P 330 85.5512 0.330437 0
AU.COEN.BHZ. 2018-09-18T07:40:13.45 10.0 positive automatic P 103 84.1561 1.24927 0.130581
II.AAK.BHZ.00 2018-09-18T07:40:07.52 10.0 positive automatic P 18 83.3185 -0.618991 0.142009
AU.EIDS.BHZ. 2018-09-18T07:40:06.75 10.0 positive automatic P 117 83.0342 0.318677 0.142721
IU.CTAO.BHZ.00 2018-09-18T07:40:05.82 10.0 negative automatic P 110 82.7714 0.736811 0.146592
KZ.KKAR.BHZ. 2018-09-18T07:40:04.93 10.0 positive automatic P 15 82.8623 -0.659269 0.145824
MN.TIP.BHZ. 2018-09-18T07:40:03.92 10.0 positive automatic P 335 82.556 -0.117785 0.148415
HT.FNA.HHZ. 2018-09-18T07:40:01.80 10.0 positive automatic P 339 82.572 -2.31604 0.134515
G.COYC.BHZ.00 2018-09-18T07:40:00.45 10.0 positive automatic P 217 81.7843 0.552172 0.151518
MN.CEL.BHZ. 2018-09-18T07:39:59.92 10.0 negative automatic P 334 82.0284 -1.34269 0.117428
AU.ARMA.BHZ. 2018-09-18T07:39:53.70 10.0 positive automatic P 121 80.2836 1.64995 0.168343
II.SIMI.BHZ.00 2018-09-18T07:39:40.05 10.0 positive automatic P 15 78.2705 -0.812155 0.193806
AU.QLP.BHZ. 2018-09-18T07:39:36.77 10.0 positive automatic P 114 77.3989 0.728474 0.195447
MY.LDM.BHZ. 2018-09-18T07:39:33.12 10.0 positive automatic P 73 76.6123 1.51634 0
AU.KDU.BHZ. 2018-09-18T07:39:30.82 10.0 negative automatic P 96 76.5558 -0.438968 0.194696
G.CAN.BHZ.00 2018-09-18T07:39:27.65 10.0 positive automatic PcP 124 75.5621 1.93644 0.21885
AU.MTN.BHZ. 2018-09-18T07:39:24.90 10.0 positive automatic P 95 75.4068 0.170237 0.217879
GE.SOEI.BHZ. 2018-09-18T07:39:05.42 10.0 positive automatic P 88 71.7957 1.77178 0
AU.HTT.BHZ. 2018-09-18T07:38:51.90 10.0 negative automatic P 117 69.7457 0.789756 0.27397
AU.FITZ.BHZ. 2018-09-18T07:38:40.55 10.0 negative automatic P 96 68.0541 0.0753081 0.307877
GT.DBIC.BHZ.00 2018-09-18T07:38:36.13 10.0 negative automatic P 299 67.3849 -0.126297 0.320123
AU.WRKA.BHZ. 2018-09-18T07:38:30.20 10.0 negative automatic P 104 66.3411 0.509163 0.310852
AU.FORT.BHZ. 2018-09-18T07:38:10.12 10.0 negative automatic P 110 63.2147 0.906029 0.358141
II.RAYN.BHZ.00 2018-09-18T07:37:55.50 10.0 negative automatic P 356 61.2488 -0.622424 0.398448
IU.SBA.BHZ.00 2018-09-18T07:37:39.50 10.0 positive automatic P 167 58.6118 1.60618 0.411866
AU.MORW.BHZ. 2018-09-18T07:37:12.70 10.0 negative automatic P 102 54.8754 1.31556 0.476618
IU.CASY.BHZ.00 2018-09-18T07:35:53.02 10.0 negative automatic P 150 44.411 1.46965 0.606854
GE.SNAA.BHZ. 2018-09-18T07:35:40.06 10.0 positive automatic P 201 43.0797 -0.919808 0.689083
IU.TSUM.BHZ.00 2018-09-18T07:34:19.87 10.0 positive automatic P 294 33.5094 -0.629885 0.877693
AU.MAW.BHZ. 2018-09-18T07:33:56.14 10.0 positive automatic P 170 30.8921 -1.17526 0.967808
GE.SBV.BHZ. 2018-09-18T07:32:57.35 10.0 positive automatic P 0 24.1369 0.629558 0.930233
II.SUR.BHZ.00 2018-09-18T07:32:57.52 10.0 positive automatic P 274 24.2039 -0.110162 0.888889
GT.LBTB.BHZ.00 2018-09-18T07:32:55.13 10.0 positive automatic P 295 24.0862 -1.31735 0.91954
GT.BOSA.BHZ.00 2018-09-18T07:32:39.70 10.0 positive automatic P 286 22.3403 0.979662 0.963855
AF.SOE.BHZ. 2018-09-18T07:32:18.70 10.0 positive automatic P 277 20.3387 1.612 0.151515
AF.GRHM.BHZ. 2018-09-18T07:32:09.72 10.0 positive automatic P 276 19.5032 1.77976 0.930233
II.ABPO.BHZ.00 2018-09-18T07:32:00.07 10.0 positive automatic P 352 18.7114 0.661753 0.43956
AF.POGA.BHZ. 2018-09-18T07:31:56.30 10.0 positive automatic P 299 18.326 1.49716 0.909091
G.RER.BHZ.00 2018-09-18T07:31:40.25 10.0 positive automatic P 19 17.2122 -0.856691 0.909091
GE.VOI.BHZ. 2018-09-18T07:31:23.10 10.0 positive automatic P 350 15.9005 -1.35829 0.909091
G.FOMA.BHZ.00 2018-09-18T07:30:43.40 10.0 negative automatic P 348 12.8445 0.40264 0.952381
G.CRZF.BHZ.00 2018-09-18T07:29:46.45 10.0 positive automatic P 171 8.9659 -3.47113 0.851064
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