Earthquake with magnitude of Mwp 6.2 on date 18-03-2021 and time 01:04:09 (Italy) in region Algeria [Sea]

A magnitude Mwp 6.2 earthquake occured in region: Algeria [Sea], on

  • 18-03-2021 00:04:09 (UTC)
  • 18-03-2021 01:04:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.023, 5.181 at 13 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 6.2
2021-03-18
00:04:09
37.023 5.1812 13 2021-03-18
00:11:59
Sala Sismica INGV-Roma 88233771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-18 00:04:09
Latitude 37.0230
Longitude 5.1812
Depth (km) 13 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 88233771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2947
Semi-minor axis of confidence ellipse (meter) 103
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 158
Circular confidence region, given by single value of horizontal uncertainty (meter) 2379.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94.4343
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.45693
Epicentral distance of station closest to the epicenter (degree) 2.9606
Epicentral distance of station farthest from the epicenter (degree) 15.8871
Number of stations at which the event was observed 39
Number of stations from which data was used for origin computation 39
Magnitudes information

Mwp:6.2

Field Value
Value 6.2
Uncertainty 0.2
Num. used stations 16
Type of magnitude Mwp
Reference to an origin 88233771
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-18 00:11:59

mb:5.5

Field Value
Value 5.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude mb
Reference to an origin 88233771
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-03-18 00:11:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GE.FLT1.BHZ. 2021-03-18T00:07:52.95 10.0 negative automatic P 14 15.8871 0.92038 0
GE.IBBN.BHZ. 2021-03-18T00:07:50.40 10.0 positive automatic pP 6 15.3896 -3.41327 0
GE.IBBN.BHZ. 2021-03-18T00:07:45.65 10.0 positive automatic P 6 15.3896 0.0911495 0.930233
MN.BZS.BHZ. 2021-03-18T00:07:40.12 10.0 negative automatic P 50 15.0083 -0.434902 0.43956
G.TAM.BHZ.00 2021-03-18T00:07:27.95 10.0 positive automatic P 179 14.2341 -2.25487 0.97561
HL.ITM.HHZ. 2021-03-18T00:07:17.37 10.0 negative automatic P 84 13.3376 -0.431773 0.970874
IU.GRFO.BHZ.00 2021-03-18T00:07:18.27 10.0 positive automatic P 17 13.3956 -0.316152 0.888889
GB.JSA.BHZ. 2021-03-18T00:07:17.22 10.0 positive automatic P 339 13.2805 0.257872 0
HU.KOVH.BHZ. 2021-03-18T00:07:15.00 10.0 negative automatic P 43 13.2208 -0.185252 0.888889
RD.ROSF.BHZ. 2021-03-18T00:07:11.88 10.0 positive automatic P 334 12.8892 0.226536 0.961538
GE.WLF.BHZ. 2021-03-18T00:07:07.95 10.0 positive automatic P 3 12.6604 -0.580735 0.909091
MN.PDG.BHZ. 2021-03-18T00:07:02.07 10.0 positive automatic P 59 12.0819 1.49217 0.952381
GE.STU.BHZ. 2021-03-18T00:07:02.15 10.0 negative automatic P 13 12.1062 1.18032 0.909091
MN.BLY.BHZ. 2021-03-18T00:06:59.17 10.0 positive automatic P 46 11.8946 1.11318 0.952381
OE.KBA.BHZ. 2021-03-18T00:06:57.27 10.0 positive automatic P 28 11.7257 1.27322 0.833333
G.ECH.BHZ.00 2021-03-18T00:06:47.80 10.0 negative automatic P 7 11.2859 -1.98571 0.952381
OE.DAVA.BHZ. 2021-03-18T00:06:45.37 10.0 positive automatic P 17 10.8329 1.6067 0.930233
LX.MORF.BHZ. 2021-03-18T00:06:45.08 10.0 positive automatic P 276 11.0176 -1.02633 0.888889
LX.MESJ.BHZ. 2021-03-18T00:06:39.71 10.0 positive automatic P 278 10.6631 -1.4939 0.930233
WM.AVE.BHZ. 2021-03-18T00:06:43.80 10.0 negative automatic P 254 10.9383 -1.16755 0.930233
GE.MTE.BHZ. 2021-03-18T00:06:40.10 10.0 positive automatic P 293 10.476 1.35431 0.930233
PM.PESTR.BHZ. 2021-03-18T00:06:36.55 10.0 negative automatic P 284 10.2294 1.25233 0.930233
RD.MFF.BHZ. 2021-03-18T00:06:36.92 10.0 positive automatic P 339 10.3626 -0.172542 0.854701
PM.PVAQ.BHZ. 2021-03-18T00:06:34.22 10.0 negative automatic P 276 10.2707 -1.60701 0.97561
RD.LOR.BHZ. 2021-03-18T00:06:34.56 10.0 negative automatic P 355 10.2911 -1.59654 0.970874
GE.MATE.BHZ. 2021-03-18T00:06:27.10 10.0 positive automatic P 64 9.6707 -0.55577 0.930233
IV.SALO.BHZ. 2021-03-18T00:06:25.50 10.0 positive automatic P 23 9.4799 0.439946 0.952381
WM.SFS.BHZ. 2021-03-18T00:06:24.10 10.0 positive automatic P 270 9.1354 3.86184 0.952381
IV.BOB.BHZ. 2021-03-18T00:06:09.30 10.0 negative automatic P 21 8.386 -0.816606 0.930233
IV.MONC.BHZ. 2021-03-18T00:06:09.30 10.0 negative automatic P 14 8.3111 0.285288 0.888889
MN.AQU.BHZ. 2021-03-18T00:06:08.57 10.0 negative automatic P 47 8.2672 0.125365 0.43956
G.SSB.BHZ.00 2021-03-18T00:06:07.25 10.0 positive automatic P 357 8.2695 -1.225 0.930233
MN.BNI.BHZ. 2021-03-18T00:06:06.77 10.0 positive automatic P 8 8.1072 0.404244 0.987654
IU.PAB.BHZ.00 2021-03-18T00:06:03.12 10.0 positive automatic P 292 7.8898 -0.190525 0.97561
IV.MGAB.BHZ. 2021-03-18T00:06:02.00 10.0 negative automatic P 40 7.9251 -0.729419 0.869565
RD.MTLF.BHZ. 2021-03-18T00:05:46.68 10.0 negative automatic P 341 6.71 -0.3353 0.819672
MN.CLTB.BHZ. 2021-03-18T00:05:41.20 10.0 positive automatic P 83 6.4132 -1.84559 0.930233
RD.PGF.BHZ. 2021-03-18T00:05:39.12 10.0 positive automatic P 27 6.254 -1.75963 0.961538
WM.CART.BHZ. 2021-03-18T00:05:21.17 10.0 negative automatic P 278 4.9486 -1.59273 0.930233
WM.MAHO.BHZ. 2021-03-18T00:04:54.40 10.0 negative automatic P 346 2.9606 -1.02358 0.909091
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