Earthquake with magnitude of Md 2.4 on date 23-06-1987 and time 12:40:48 (Italy) in region 6 km NE Forlì (FC)

A magnitude Md 2.4 earthquake occured in region: 6 km NE Forlì (FC), on

  • 23-06-1987 10:40:48 (UTC)
  • 23-06-1987 12:40:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.26, 12.1 at 8 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Forlì FC 6 117913 117913
Forlimpopoli FC 8 13290 131203
Bertinoro FC 12 11059 142262
Russi RA 14 12247 154509
Meldola FC 15 9970 164479
Castrocaro Terme e Terra del Sole FC 15 6426 170905
Cesena FC 17 96758 267663
Faenza RA 18 58541 326204
Cotignola RA 19 7474 333678
Predappio FC 20 6346 340024
Ravenna RA 20 159116 499140
Cervia RA 20 28940 528080

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NE of Forlì (117913 inhabitants)
17 Km NW of Cesena (96758 inhabitants)
18 Km E of Faenza (58541 inhabitants)
20 Km SW of Ravenna (159116 inhabitants)
33 Km E of Imola (69797 inhabitants)
43 Km NW of Rimini (147750 inhabitants)
66 Km E of Bologna (386663 inhabitants)
75 Km SE of Ferrara (133155 inhabitants)
75 Km NW of Pesaro (94582 inhabitants)
87 Km NE of Firenze (382808 inhabitants)
87 Km NW of Fano (60888 inhabitants)
89 Km N of Arezzo (99543 inhabitants)
90 Km E of Prato (191150 inhabitants)
92 Km NE of Scandicci (50609 inhabitants)
94 Km S of Rovigo (51867 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 Md 2.4 1987-06-23
10:40:48
44.26 12.1 8 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 49399
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-06-23 10:40:48 ± 0.367
Latitude 44.26 ± 0.02
Longitude 12.10 ± 0.01
Depth (km) 8 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 49399

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) 2623
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 285
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00413
Epicentral distance of station farthest from the epicenter (degree) 0.01125
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 49399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:48:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-06-23T10:41:22.00 10.0 undecidable manual SG 140 0.0087 0.21 0.3
--.ASS.Z. 1987-06-23T10:41:12.00 10.0 undecidable manual PN 161 0.0113 0 1.8
--.ARV.Z. 1987-06-23T10:41:07.50 10.0 undecidable manual PG 140 0.0087 -0.14 1.2
--.PGD.Z. 1987-06-23T10:41:05.50 10.0 undecidable manual SG 215 0.0041 -0.21 0.3
--.PGD.Z. 1987-06-23T10:40:58.50 10.0 undecidable manual PG 215 0.0041 0.14 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download