Earthquake with magnitude of Mwp 6.1 on date 20-04-2021 and time 01:58:25 (Italy) in region Off west coast of northern Sumatera, Indonesia [Sea: Indonesia]

A magnitude Mwp 6.1 earthquake occured in region: Off west coast of northern Sumatera, Indonesia [Sea: Indonesia], on

  • 19-04-2021 23:58:25 (UTC)
  • 20-04-2021 01:58:25 (UTC +02:00) Italian time
  • 20-04-2021 07:58:25 (UTC +08:00) local time in the region of the earthquake (Asia/Kuala_Lumpur)

and geographic coordinates (lat, lon) 0.218, 96.616 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

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and adjourned progressively as more data become available. See http://shakemap.rm.ingv.it/ for additional information.

The red star indicates the epicenter. The red triangles show the stations of the INGV Italian National Seismic Network and the blue triangles those of the Nationa Accelerometric Network of the Dipartimento della Protezione Civile.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of the istrumentally derived intensities. To this purpose, it is used a conversion relation between ground acceleration and velocity, and the Mercalli Modificata (MMI - Modified Mercalli Intensity) scale. In general, the Mercalli intensity scale relies on the effects that the ground shaking produces as reported by an observer.
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows This map shows the distribution of peak ground acceleration expressed as per cent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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
Reviewed
Rev100
mb 5.5
Mwp 6.1

Mwpd 6.2
2021-04-19
23:58:25
0.218 96.6164 20 2021-04-20
06:00:22
Sala Sismica INGV-Roma 89284421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-19 23:58:25
Latitude 0.2180
Longitude 96.6164
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 89284421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 8261
Semi-minor axis of confidence ellipse (meter) 340
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 31
Circular confidence region, given by single value of horizontal uncertainty (meter) 6673.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 47.1368
Number of associated phases, regardless of their use for origin computation 128
Number of defining phases 128
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.42658
Epicentral distance of station closest to the epicenter (degree) 1.4487
Epicentral distance of station farthest from the epicenter (degree) 82.82025
Number of stations at which the event was observed 111
Number of stations from which data was used for origin computation 111
Magnitudes information

Mwpd:6.2

Field Value
Value 6.2
Uncertainty 0.1
Num. used stations 47
Type of magnitude Mwpd
Reference to an origin 89284421
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-04-20 06:00:22

Mwp:6.1

Field Value
Value 6.1
Uncertainty 0.1
Num. used stations 56
Type of magnitude Mwp
Reference to an origin 89284421
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-04-20 06:00:22

mb:5.5

Field Value
Value 5.5
Uncertainty 0.1
Num. used stations 66
Type of magnitude mb
Reference to an origin 89284421
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-04-20 06:00:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
MN.CEL.BHZ. 2021-04-20T00:10:46.17 10.0 negative automatic P 309 82.5879 0.0461068 0.0980032
GE.MORC.BHZ. 2021-04-20T00:10:46.50 10.0 negative automatic P 320 82.7979 -0.721748 0.146368
MN.CUC.BHZ. 2021-04-20T00:10:45.97 10.0 positive automatic P 310 82.8203 -1.35115 0
AT.SMY.BHZ. 2021-04-20T00:10:44.12 10.0 negative automatic P 37 82.2822 -0.301689 0.0533077
MN.BLY.BHZ. 2021-04-20T00:10:44.22 10.0 negative automatic P 315 82.3578 -0.63061 0
MN.TIP.BHZ. 2021-04-20T00:10:42.67 10.0 positive automatic P 310 82.0122 -0.457177 0.146266
GE.SLIT.BHZ. 2021-04-20T00:10:38.20 10.0 positive automatic P 329 81.4935 -2.06899 0.153995
IU.SNZO.BHZ.00 2021-04-20T00:10:38.42 10.0 negative automatic P 132 81.2225 -0.425401 0
GE.PSZ.BHZ. 2021-04-20T00:10:35.65 10.0 positive automatic P 319 80.9782 -2.03734 0.170026
MN.PDG.BHZ. 2021-04-20T00:10:33.67 10.0 negative automatic P 313 80.5494 -1.56944 0.169898
IU.TSUM.BHZ.00 2021-04-20T00:10:31.82 10.0 negative automatic P 250 79.7192 0.853351 0
HU.LTVH.BHZ. 2021-04-20T00:10:29.71 10.0 negative automatic P 318 79.5522 -0.158946 0.175024
PL.KWP.BHZ. 2021-04-20T00:10:28.58 10.0 negative automatic P 321 79.4859 -0.97396 0.16783
MN.BZS.BHZ. 2021-04-20T00:10:27.87 10.0 negative automatic P 317 79.3924 -1.14871 0.180703
GE.VSU.BHZ. 2021-04-20T00:10:26.80 10.0 negative automatic P 330 79.443 -2.4636 0.184619
HT.LIT.HHZ. 2021-04-20T00:10:17.96 10.0 negative automatic P 311 77.7778 -2.20759 0.197278
IU.KIEV.BHZ.00 2021-04-20T00:10:06.62 10.0 negative automatic P 323 75.7309 -1.93274 0.217092
AU.MCQ.BHZ.00 2021-04-20T00:10:02.78 10.0 positive automatic P 148 74.5412 1.1076 0.22693
KO.DKL.BHZ. 2021-04-20T00:09:59.26 10.0 positive automatic P 311 74.2371 -0.64149 0
GE.TIRR.BHZ. 2021-04-20T00:09:59.80 10.0 negative automatic P 317 74.4699 -1.46936 0.219923
IU.TIXI.BHZ.00 2021-04-20T00:09:58.37 10.0 positive automatic P 10 74.3275 -2.06252 0.226529
GT.BOSA.BHZ.00 2021-04-20T00:09:56.58 10.0 positive automatic P 240 73.8112 -1.04906 0.237501
IU.PET.BHZ.00 2021-04-20T00:09:55.77 10.0 positive automatic P 34 73.4314 0.579281 0.230665
KO.BALB.HHZ. 2021-04-20T00:09:55.21 10.0 negative automatic P 312 73.6353 -1.18466 0.231696
GE.KARP.BHZ. 2021-04-20T00:09:54.05 10.0 positive automatic P 307 73.2738 -0.286462 0.237721
HL.ARG.HHZ. 2021-04-20T00:09:50.59 10.0 negative automatic P 308 72.6587 -0.0379013 0.22844
IU.MA2.BHZ.00 2021-04-20T00:09:49.42 10.0 positive automatic P 25 72.5492 -0.590354 0.245573
AU.MAW.BHZ. 2021-04-20T00:09:44.48 10.0 positive automatic P 193 71.7391 -0.627857 0
ND.ONTNC.BHZ.00 2021-04-20T00:09:44.65 10.0 positive automatic P 114 71.4886 1.035 0.257296
KO.ELL.BHZ. 2021-04-20T00:09:42.90 10.0 positive automatic P 309 71.3877 -0.294105 0.262084
KO.MDUB.BHZ. 2021-04-20T00:09:41.84 10.0 negative automatic P 313 71.3993 -1.40362 0.269582
IU.ANTO.BHZ.00 2021-04-20T00:09:33.52 10.0 negative automatic P 313 70.0575 -1.55498 0.276767
KO.BZK.BHZ. 2021-04-20T00:09:32.70 10.0 negative automatic P 315 69.8394 -0.873498 0.282643
ND.KOUNC.BHZ.00 2021-04-20T00:09:30.75 10.0 negative automatic P 112 69.2385 0.899968 0.289814
GE.CSS.BHZ. 2021-04-20T00:09:23.05 10.0 negative automatic P 308 68.2444 -0.659378 0.294855
KO.BNN.BHZ. 2021-04-20T00:09:18.30 10.0 negative automatic P 313 67.4973 -0.877411 0
IU.CASY.BHZ.00 2021-04-20T00:09:16.77 10.0 negative automatic P 174 67.2301 -0.478349 0.287092
IU.YAK.BHZ.00 2021-04-20T00:09:11.82 10.0 positive automatic P 16 66.6436 -1.71438 0.321814
IS.KZIT.BHZ. 2021-04-20T00:09:11.26 10.0 negative automatic P 304 66.3018 -0.108049 0.318569
GE.SALP.BHZ. 2021-04-20T00:09:09.32 10.0 negative automatic P 305 65.9591 0.107082 0.330534
II.MBAR.BHZ.00 2021-04-20T00:09:09.37 10.0 negative automatic P 269 65.8794 0.515464 0.323847
IS.GEM.BHZ. 2021-04-20T00:09:09.18 10.0 negative automatic P 307 65.899 0.395857 0.331306
KO.GAZ.BHZ. 2021-04-20T00:09:08.98 10.0 negative automatic P 311 65.9284 -0.122221 0.33411
GE.MSBI.BHZ. 2021-04-20T00:09:06.70 10.0 negative automatic P 305 65.6166 -0.18394 0.287093
GE.EIL.BHZ. 2021-04-20T00:09:06.20 10.0 negative automatic P 303 65.5234 -0.154122 0.336146
II.KIV.BHZ.00 2021-04-20T00:09:00.17 10.0 negative automatic P 320 64.7525 -1.32944 0.34619
II.ARTI.BHZ.00 2021-04-20T00:08:54.17 10.0 negative automatic P 338 64.0208 -2.40853 0.364541
IU.HNR.BHZ.00 2021-04-20T00:08:54.02 10.0 positive automatic P 101 63.7573 -0.785348 0.241501
II.TAU.BHZ.00 2021-04-20T00:08:47.37 10.0 negative automatic P 140 62.528 0.712846 0.367258
AF.ZOMB.BHZ. 2021-04-20T00:08:46.69 10.0 positive automatic P 252 62.4485 0.435675 0.36832
IU.YSS.BHZ.00 2021-04-20T00:08:40.85 10.0 negative automatic P 34 61.5947 0.45483 0.371201
IU.GNI.BHZ.00 2021-04-20T00:08:40.37 10.0 negative automatic P 317 61.6797 -0.847736 0.387696
AU.MILA.BHZ.00 2021-04-20T00:08:37.95 10.0 negative automatic P 134 61.1088 0.730297 0.386464
AU.ARMA.BHZ. 2021-04-20T00:08:34.32 10.0 negative automatic P 126 60.4899 1.26094 0.404398
II.ERM.BHZ.00 2021-04-20T00:08:34.82 10.0 positive automatic sP 39 59.0945 3.5042 0
G.CAN.BHZ.00 2021-04-20T00:08:31.65 10.0 negative automatic P 132 60.2701 0.159432 0.407521
JP.JKA.BHZ. 2021-04-20T00:08:29.80 10.0 positive automatic sP 40 58.2592 4.24934 0
AU.EIDS.BHZ. 2021-04-20T00:08:18.70 10.0 negative automatic P 120 58.429 0.0179703 0.379891
JP.JTM.BHZ. 2021-04-20T00:08:09.50 10.0 negative automatic P 39 57.1113 0.0939973 0.453747
G.ATD.BHZ.00 2021-04-20T00:07:51.75 10.0 negative automatic P 284 54.557 0.573554 0.4405
AU.MORW.BHZ. 2021-04-20T00:05:12.02 10.0 negative automatic P 149 34.6684 -0.539451 0.824206
GE.VOI.BHZ. 2021-04-20T00:07:42.35 10.0 positive automatic P 242 53.3321 0.0274732 0.512309
IU.MAJO.BHZ.00 2021-04-20T00:07:41.57 10.0 positive automatic P 42 52.9023 2.54786 0.33548
AU.QLP.BHZ. 2021-04-20T00:07:40.40 10.0 negative automatic P 124 53.0493 0.318779 0.523063
IU.CTAO.BHZ.00 2021-04-20T00:07:37.12 10.0 negative automatic P 116 52.6317 0.0992674 0.478029
II.KURK.BHZ.00 2021-04-20T00:07:36.60 10.0 positive automatic P 346 52.759 -1.33857 0.534221
II.ABPO.BHZ.00 2021-04-20T00:07:33.97 10.0 positive automatic P 245 52.1063 0.645411 0.519695
AU.HTT.BHZ. 2021-04-20T00:07:32.20 10.0 negative automatic P 135 52.0378 -0.475732 0.533184
G.INU.BHZ.00 2021-04-20T00:07:30.91 10.0 positive automatic P 43 51.4463 2.75608 0.350772
II.TLY.BHZ.00 2021-04-20T00:07:30.47 10.0 negative automatic P 6 51.8008 -0.411306 0.537051
JP.JGF.BHZ. 2021-04-20T00:07:30.15 10.0 positive automatic P 42 51.8078 -0.783546 0.51253
IU.ULN.BHZ.00 2021-04-20T00:07:04.92 10.0 negative automatic P 9 48.4998 -1.1102 0.592371
JP.JMN.BHZ. 2021-04-20T00:07:04.90 10.0 negative automatic P 42 48.3911 -0.110184 0.567228
IU.MAKZ.BHZ.00 2021-04-20T00:07:02.97 10.0 negative automatic P 347 48.316 -1.47118 0.532176
II.AAK.BHZ.00 2021-04-20T00:06:52.52 10.0 negative automatic P 338 46.8355 -0.602112 0.606841
JP.JTU.BHZ. 2021-04-20T00:06:49.05 10.0 positive automatic P 38 45.9858 2.87713 0.293686
II.UOSS.BHZ.00 2021-04-20T00:06:48.52 10.0 positive automatic P 305 46.2118 0.525596 0.632305
JP.JSU.BHZ. 2021-04-20T00:06:40.30 10.0 positive automatic P 42 44.7515 3.85153 0.564405
AU.FORT.BHZ.00 2021-04-20T00:06:22.35 10.0 negative automatic P 139 43.0244 -0.179217 0.690108
II.WRAB.BHZ.00 2021-04-20T00:06:14.15 10.0 negative automatic P 121 42.0892 -0.822989 0.699221
AU.WRKA.BHZ.00 2021-04-20T00:05:54.93 10.0 negative automatic P 132 39.697 -0.368327 0.762221
IU.NWAO.BHZ.00 2021-04-20T00:05:43.22 10.0 negative automatic P 152 38.4163 -1.31462 0.797121
AU.KDU.BHZ.00 2021-04-20T00:05:37.65 10.0 negative automatic P 111 37.8259 -1.85059 0.771435
AU.MTN.BHZ.00 2021-04-20T00:05:27.45 10.0 negative automatic P 112 36.6291 -1.91115 0.776723
GE.FAKI.BHZ. 2021-04-20T00:05:21.17 10.0 positive automatic P 95 35.7541 -0.709745 0.793619
IU.TATO.BHZ.00 2021-04-20T00:05:15.97 10.0 positive automatic P 42 34.5146 4.76468 0.836888
IU.MBWA.BHZ.00 2021-04-20T00:04:40.75 10.0 positive automatic P 135 31.0911 -0.529169 0.951619
IO.EVN.BHZ. 2021-04-20T00:04:26.00 10.0 negative automatic P 342 29.2878 -0.163703 0.952381
GE.SANI.BHZ. 2021-04-20T00:04:26.97 10.0 negative automatic P 95 29.452 0.21218 0.909091
GE.SOEI.BHZ. 2021-04-20T00:04:22.42 10.0 negative automatic P 111 29.2678 -2.88231 0
GE.LUWI.BHZ. 2021-04-20T00:03:57.67 10.0 negative automatic P 93 26.1832 0.153363 0.909091
II.DGAR.BHZ.00 2021-04-20T00:03:50.42 10.0 positive automatic P 252 25.2755 1.13503 0.930233
GE.KAAM.BHZ. 2021-04-20T00:03:36.32 10.0 positive automatic P 271 23.6217 2.11367 0.952381
II.KAPI.BHZ.00 2021-04-20T00:03:34.70 10.0 negative automatic P 103 23.6906 -0.196719 0.941176
MY.LDM.BHZ. 2021-04-20T00:03:23.92 10.0 positive automatic P 77 22.405 2.34038 0.869565
RM.SLV.BHZ. 2021-04-20T00:03:19.92 10.0 positive automatic P 18 22.2737 -0.343454 0.952381
GE.BKB.BHZ. 2021-04-20T00:03:02.62 10.0 positive automatic P 94 20.3297 3.36604 0.909091
MY.KKM.BHZ. 2021-04-20T00:03:01.17 10.0 positive automatic P 73 20.4086 0.937525 0.97561
GE.JAGI.BHZ. 2021-04-20T00:02:49.72 10.0 positive automatic P 117 19.5128 -0.643602 0.666667
IU.CHTO.BHZ.00 2021-04-20T00:02:40.85 10.0 positive automatic P 7 18.7352 -1.03835 0.952381
GE.MALK.BHZ. 2021-04-20T00:02:34.87 10.0 positive automatic P 297 17.9812 1.76946 0.97561
II.PALK.BHZ.00 2021-04-20T00:02:26.70 10.0 positive automatic S 294 17.3665 1.13235 0.43956
GE.HALK.BHZ. 2021-04-20T00:02:19.60 10.0 positive automatic P 291 16.9524 -0.726132 0.97561
RM.DLV.BHZ. 2021-04-20T00:02:15.62 10.0 positive automatic P 45 16.6239 -0.758023 0.769231
MY.SBM.BHZ. 2021-04-20T00:02:05.72 10.0 positive automatic P 82 15.751 0.691436 0.930233
GE.SMRI.BHZ. 2021-04-20T00:02:03.67 10.0 positive automatic P 118 15.5872 0.775596 0.930233
GE.MNAI.BHZ. 2021-04-20T00:00:15.02 10.0 positive automatic ScP 126 7.8147 -1.90381 0.952381
II.COCO.BHZ.00 2021-04-20T00:01:19.77 10.0 positive automatic P 179 12.4095 -0.0641487 0
GE.LHMI.BHZ. 2021-04-19T23:59:37.32 10.0 positive automatic P 4 5.0215 -1.21899 0.909091
GE.BKNI.BHZ. 2021-04-19T23:59:30.17 10.0 positive automatic P 89 4.4243 -0.175046 0.952381
GE.GSI.BHZ. 2021-04-19T23:58:49.02 10.0 positive automatic P 41 1.4487 -0.414875 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