Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 04-08-1987 and time 20:25:04 (Italy) in region 2 km NE Bertinoro (FC)

A magnitude Md 2.5 earthquake occured in region: 2 km NE Bertinoro (FC), on

  • 04-08-1987 18:25:04 (UTC)
  • 04-08-1987 20:25:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1590, 12.1520 at 5 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bertinoro FC 2 11059 11059
Forlimpopoli FC 4 13290 24349
Cesena FC 8 96758 121107
Meldola FC 8 9970 131077
Forlì FC 11 117913 248990
Montiano FC 15 1716 250706
Predappio FC 15 6346 257052
Gambettola FC 16 10660 267712
Castrocaro Terme e Terra del Sole FC 16 6426 274138
Longiano FC 17 7126 281264
Roncofreddo FC 19 3386 284650
Cervia RA 20 28940 313590
Gatteo FC 20 9068 322658

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km W of Cesena (96758 inhabitants)
11 Km SE of Forlì (117913 inhabitants)
26 Km SE of Faenza (58541 inhabitants)
29 Km S of Ravenna (159116 inhabitants)
35 Km W of Rimini (147750 inhabitants)
41 Km SE of Imola (69797 inhabitants)
67 Km W of Pesaro (94582 inhabitants)
74 Km SE of Bologna (386663 inhabitants)
78 Km W of Fano (60888 inhabitants)
80 Km N of Arezzo (99543 inhabitants)
84 Km NE of Firenze (382808 inhabitants)
86 Km SE of Ferrara (133155 inhabitants)
89 Km E of Scandicci (50609 inhabitants)
90 Km E of Prato (191150 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
Bulletin
Rev1000 		Md 2.5
ML-VAX 2.1 		1987-08-04
18:25:04		 44.159 12.152 5 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 53399
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-08-04 18:25:04 ± 0.355
Latitude 44.1590 ± 0.0137
Longitude 12.1520 ± 0.0197
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 53399

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) 2187.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.02234
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 53399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:51:30

ML:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 6
Type of magnitude ML
Reference to an origin 53399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.FOI.Z. 1987-08-04T18:25:45.15 10.0 undecidable manual PN 9 2.4753 -0.08 1.3
--.RBL.Z. 1987-08-04T18:25:45.19 10.0 undecidable manual PN 22 2.4753 -0.24 1.2
--.PS9.Z. 1987-08-04T18:25:45.36 10.0 undecidable manual SN 249 1.2543 -0.69 0.4
--.ASS.Z. 1987-08-04T18:25:43.12 10.0 undecidable manual SN 161 1.1544 -0.63 0.4
--.BDI.Z. 1987-08-04T18:25:43.70 10.0 undecidable manual SN 265 1.11 0.76 0.3
--.CTI.Z. 1987-08-04T18:25:37.00 10.0 undecidable manual PN 349 1.9092 -0.64 0.8
--.ARV.Z. 1987-08-04T18:25:36.53 10.0 undecidable manual SG 138 0.8769 1.21 0.1
--.AM8.Z. 1987-08-04T18:25:29.00 10.0 undecidable manual PN? 119 1.1988 1.13 0.1
--.CM8.Z. 1987-08-04T18:25:28.40 10.0 undecidable manual PN 142 1.1988 0.28 1.8
--.PS9.Z. 1987-08-04T18:25:28.53 10.0 undecidable manual PN 249 1.2543 0.09 2
--.BDI.Z. 1987-08-04T18:25:27.66 10.0 undecidable manual PN 265 1.11 1.01 0.4
--.ASS.Z. 1987-08-04T18:25:27.30 10.0 undecidable manual PN 161 1.1544 0.18 2
--.CRE.Z. 1987-08-04T18:25:24.35 10.0 undecidable manual SG 194 0.555 -0.87 0.2
--.ARV.Z. 1987-08-04T18:25:21.81 10.0 undecidable manual PG 138 0.8769 -0.43 1.6
--.PGD.Z. 1987-08-04T18:25:20.77 10.0 undecidable manual SG 227 0.4107 0.15 0.8
--.SS9.Z. 1987-08-04T18:25:16.41 10.0 undecidable manual SG 222 0.3108 -0.44 0.6
--.CRE.Z. 1987-08-04T18:25:15.84 10.0 undecidable manual PG 194 0.555 -0.57 1.2
--.PGD.Z. 1987-08-04T18:25:13.67 10.0 undecidable manual PG 227 0.4107 -0.09 2.1
--.SS9.Z. 1987-08-04T18:25:11.93 10.0 undecidable manual PG 222 0.3108 0.35 1.7
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