Earthquake with magnitude of M 3.8 on date 24-04-1987 and time 08:22:09 (Italy) in region Northern Algeria [Land: Algeria]

A magnitude M 3.8 earthquake occured in region: Northern Algeria [Land: Algeria], on

  • 24-04-1987 06:22:09 (UTC)
  • 24-04-1987 08:22:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.56, 5.54 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 M 3.8 1987-04-24
06:22:09
36.56 5.54 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 45529
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-24 06:22:09 ± 0.767
Latitude 36.56 ± 0.05
Longitude 5.54 ± 0.05
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 45529

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 7343.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 307
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.05861
Epicentral distance of station farthest from the epicenter (degree) 0.0807
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

M:3.8

Field Value
Value 3.8
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 45529
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:42:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.EPF.Z. 1987-04-24T06:25:20.10 10.0 undecidable manual SN 332 0.0684 -0.2 0.6
--.SBF.Z. 1987-04-24T06:25:16.30 10.0 undecidable manual SN 12 0.0669 0.11 0.7
--.FRF.Z. 1987-04-24T06:25:06.80 10.0 undecidable manual SN 8 0.0633 -0.07 0.7
--.LMR.Z. 1987-04-24T06:25:00.70 10.0 undecidable manual SN 8 0.0612 -0.54 0.5
--.CVF.Z. 1987-04-24T06:24:55.30 10.0 undecidable manual SN 24 0.0586 0.85 0.4
--.LPG.Z. 1987-04-24T06:24:20.20 10.0 undecidable manual PN 7 0.0807 1.97 0.1
--.BNI.Z. 1987-04-24T06:24:12.00 10.0 undecidable manual PN 7 0.0767 -0.07 1.6
--.DA9.Z. 1987-04-24T06:24:05.50 10.0 undecidable manual PN 10 0.0723 0.13 1.6
--.FIN.Z. 1987-04-24T06:24:04.00 10.0 undecidable manual PN 16 0.0711 0.51 1.3
--.STV.Z. 1987-04-24T06:24:01.00 10.0 undecidable manual PN 11 0.0702 -1.11 0.6
--.EPF.Z. 1987-04-24T06:23:59.70 10.0 undecidable manual PN 332 0.0684 0.25 1.6
--.SBF.Z. 1987-04-24T06:23:56.00 10.0 undecidable manual PN 12 0.0669 -1.08 0.6
--.FRF.Z. 1987-04-24T06:23:51.20 10.0 undecidable manual PN 8 0.0633 -0.5 1.4
--.LMR.Z. 1987-04-24T06:23:48.30 10.0 undecidable manual PN 8 0.0612 -0.15 1.7
--.CVF.Z. 1987-04-24T06:23:44.50 10.0 undecidable manual PN 24 0.0586 -0.03 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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