Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Mwp 5.9 on date 15-04-2023 and time 15:01:35 (UTC) in region Southwest Indian Ridge [Sea]

A magnitude Mwp 5.9 earthquake occured in region: Southwest Indian Ridge [Sea], on

  • 15-04-2023 15:01:35 (UTC)
  • 15-04-2023 17:01:35 (UTC +02:00) Italian time
  • 15-04-2023 19:01:35 (UTC +04:00) local time in the region of the earthquake (Indian/Reunion)

and geographic coordinates (lat, lon) -33.6020, 56.2060 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.

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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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		mb 5.3
Mwp 5.9
Mwpd 6.0 		2023-04-15
15:01:35		 -33.6023 56.2061 1 2023-04-15
15:19:52		 Sala Sismica INGV-Roma 116411101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-15 15:01:35
Latitude -33.6023
Longitude 56.2061
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 116411101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 13308
Semi-minor axis of confidence ellipse (meter) 10292
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 44
Circular confidence region, given by single value of horizontal uncertainty (meter) 12398.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 57.7652
Number of associated phases, regardless of their use for origin computation 58
Number of defining phases 58
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.22261
Epicentral distance of station closest to the epicenter (degree) 11.78558
Epicentral distance of station farthest from the epicenter (degree) 95.48929
Number of stations at which the event was observed 54
Number of stations from which data was used for origin computation 54
Magnitudes information

Mwpd:6.0

Field Value
Value 6.0
Uncertainty 0.1
Num. used stations 17
Type of magnitude Mwpd
Reference to an origin 116411101
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2023-04-15 15:19:52

Mwp:5.9

Field Value
Value 5.9
Uncertainty 0.1
Num. used stations 17
Type of magnitude Mwp
Reference to an origin 116411101
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2023-04-15 15:19:52

mb:5.3

Field Value
Value 5.3
Uncertainty 0.1
Num. used stations 40
Type of magnitude mb
Reference to an origin 116411101
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2023-04-15 15:19:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
C1.BO02.BHZ. 2023-04-15T15:15:00.15 10.0 positive automatic P 221 10599.3123 -0.379562 0.0575575
PM.PESTR.BHZ. 2023-04-15T15:14:51.82 10.0 positive automatic P 316 10377.3012 0.543982 0.0700836
RD.LOR.BHZ. 2023-04-15T15:14:51.44 10.0 positive automatic P 327 10379.388 0.0631095 0.067767
PL.KSP.BHZ. 2023-04-15T15:14:41.83 10.0 negative automatic P 336 10153.2366 -0.109652 0
OE.DAVA.BHZ. 2023-04-15T15:14:39.07 10.0 positive automatic P 331 10094.3844 -0.622512 0.0857484
PL.OJC.BHZ. 2023-04-15T15:14:32.06 10.0 positive automatic P 338 9966.6567 -2.06108 0.085394
GT.PLCA.BHZ.00 2023-04-15T15:14:39.58 10.0 negative automatic P 217 10094.8728 -0.0419856 0.0877612
GE.MORC.BHZ. 2023-04-15T15:14:34.10 10.0 positive automatic P 336 10005.9618 -1.73458 0.0752234
OE.KBA.BHZ. 2023-04-15T15:14:32.62 10.0 negative automatic P 332 9922.8228 0.116476 0.0793985
IV.PTCC.BHZ. 2023-04-15T15:14:29.20 10.0 positive automatic P 332 9861.0624 -0.516734 0.0954174
OE.ARSA.BHZ. 2023-04-15T15:14:27.82 10.0 positive automatic P 334 9847.4871 -1.29625 0.103107
PL.KWP.BHZ. 2023-04-15T15:14:26.28 10.0 negative automatic P 339 9810.1134 -1.22098 0.0120445
GE.PSZ.BHZ. 2023-04-15T15:14:22.40 10.0 positive automatic P 337 9741.1491 -2.24657 0.110083
IU.KIEV.BHZ.00 2023-04-15T15:14:21.52 10.0 positive automatic P 343 9723.4113 -2.22465 0.106211
HU.KOVH.BHZ. 2023-04-15T15:14:18.65 10.0 negative automatic P 335 9634.2228 -1.21675 0.102663
II.KURK.BHZ.00 2023-04-15T15:14:17.22 10.0 positive automatic P 14 9613.044 -1.69331 0.0852856
MN.BZS.BHZ. 2023-04-15T15:14:10.52 10.0 negative automatic P 337 9453.5592 -1.28347 0.124181
IU.MAKZ.BHZ.00 2023-04-15T15:14:03.05 10.0 positive automatic P 17 9289.2903 -1.31661 0.137368
GE.TIRR.BHZ. 2023-04-15T15:13:53.85 10.0 positive automatic P 340 9107.2281 -1.91139 0.131384
AU.EIDS.BHZ. 2023-04-15T15:13:45.12 10.0 positive automatic P 114 8882.8305 0.120519 0.170689
HL.RDO.HHZ. 2023-04-15T15:13:44.11 10.0 positive automatic P 337 8868.7002 -0.184276 0.182009
IU.CTAO.BHZ.00 2023-04-15T15:13:40.30 10.0 positive automatic P 107 8777.6025 0.432213 0.188186
HT.AGG.HHZ. 2023-04-15T15:13:40.44 10.0 positive automatic P 334 8781.3543 0.345776 0.171156
II.AAK.BHZ.00 2023-04-15T15:13:33.07 10.0 positive automatic P 14 8664.1383 -1.37643 0.189106
AU.ARMA.BHZ. 2023-04-15T15:13:33.50 10.0 positive automatic P 119 8628.9402 0.904134 0.192158
IU.GNI.BHZ.00 2023-04-15T15:13:13.52 10.0 positive automatic P 351 8269.9218 -0.74498 0.178918
AU.QLP.BHZ. 2023-04-15T15:13:11.82 10.0 positive automatic P 112 8229.2292 -0.0627309 0.21363
G.CAN.BHZ.00 2023-04-15T15:13:08.45 10.0 negative automatic P 122 8139.2304 1.24756 0.242807
II.SIMI.BHZ.00 2023-04-15T15:13:04.67 10.0 positive automatic P 10 8128.2747 -2.07126 0.230191
GE.CSS.BHZ. 2023-04-15T15:12:56.45 10.0 positive automatic P 340 7973.1078 -1.79356 0.119786
AU.KDU.BHZ.00 2023-04-15T15:12:56.80 10.0 positive automatic P 93 7955.2812 -0.40997 0.252352
GT.DBIC.BHZ.00 2023-04-15T15:12:50.53 10.0 positive automatic P 293 7810.4151 1.2187 0.279791
AU.MTN.BHZ.00 2023-04-15T15:12:49.70 10.0 positive automatic P 93 7822.4919 -0.274815 0.275185
AU.TOO.BHZ.00 2023-04-15T15:12:46.60 10.0 negative automatic P 122 7744.7697 0.845354 0.283439
IO.EVN.BHZ. 2023-04-15T15:12:33.60 10.0 positive automatic P 29 7553.6388 -2.20137 0.290428
GE.EIL.BHZ. 2023-04-15T15:12:23.10 10.0 positive automatic P 340 7368.8682 -1.30587 0.220219
AU.WRKA.BHZ.00 2023-04-15T15:11:56.93 10.0 positive automatic P 103 6904.6551 -0.128592 0.385037
IU.SBA.BHZ.00 2023-04-15T15:11:51.60 10.0 positive automatic P 167 6809.3505 0.422137 0.358239
GT.VNDA.BHZ.00 2023-04-15T15:11:45.05 10.0 positive automatic P 166 6719.8401 -0.650417 0.0649643
IU.QSPA.BHZ.00 2023-04-15T15:11:15.02 10.0 positive automatic P 180 6259.623 -2.21181 0.424209
GE.MALK.BHZ. 2023-04-15T15:10:15.17 10.0 negative automatic P 33 5320.8627 1.33957 0.602103
II.PALK.BHZ.00 2023-04-15T15:10:08.22 10.0 positive automatic P 34 5218.7427 1.48562 0.596816
GE.HALK.BHZ. 2023-04-15T15:10:00.10 10.0 negative automatic P 35 5101.9374 1.48673 0.607784
IU.CASY.BHZ.00 2023-04-15T15:09:54.52 10.0 negative automatic P 153 5040.0882 0.536875 0.617288
IU.TSUM.BHZ.00 2023-04-15T15:08:46.72 10.0 positive automatic P 283 4128.867 -0.015388 0.783671
GE.KMBO.BHZ.00 2023-04-15T15:08:46.17 10.0 positive automatic P 327 4108.5651 0.871919 0.735902
GE.WIN.BHZ. 2023-04-15T15:08:38.55 10.0 positive automatic P 278 3994.4127 2.05834 0.789137
AU.MAW.BHZ. 2023-04-15T15:08:19.65 10.0 negative automatic P 175 3798.3423 -1.31066 0.842863
AF.ALKP.BHZ. 2023-04-15T15:07:34.00 10.0 negative automatic P 268 3215.7477 0.0092186 0.888889
GT.BOSA.BHZ.00 2023-04-15T15:07:16.78 10.0 positive automatic P 272 2981.4822 0.62349 0.963855
GE.SBV.BHZ. 2023-04-15T15:06:18.65 10.0 positive automatic P 343 2324.118 0.696066 0.930233
GE.VOI.BHZ. 2023-04-15T15:04:57.65 10.0 positive automatic P 322 1591.9398 -0.482651 0.930233
G.RER.BHZ.00 2023-04-15T15:04:31.55 10.0 positive automatic P 358 1380.5625 -0.52665 0.97561
G.FOMA.BHZ.00 2023-04-15T15:04:22.40 10.0 positive automatic P 315 1308.2016 -0.62679 0.952381
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download