Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 24-10-1987 and time 19:31:17 (Italy) in region 4 km NW Porto San Giorgio (FM)

A magnitude Md 2.4 earthquake occured in region: 4 km NW Porto San Giorgio (FM), on

  • 24-10-1987 18:31:17 (UTC)
  • 24-10-1987 19:31:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2050, 13.7600 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
Porto San Giorgio FM 4 16121 16121
Fermo FM 6 37655 53776
Porto Sant'Elpidio FM 6 26152 79928
Sant'Elpidio a Mare FM 7 17110 97038
Monte Urano FM 7 8353 105391
Lapedona FM 11 1166 106557
Montegranaro FM 11 12990 119547
Altidona FM 11 3390 122937
Civitanova Marche MC 12 41983 164920
Torre San Patrizio FM 13 2048 166968
Moresco FM 13 598 167566
Pedaso FM 14 2800 170366
Monterubbiano FM 14 2230 172596
Monte San Giusto MC 14 8191 180787
Ponzano di Fermo FM 14 1674 182461
Rapagnano FM 14 2145 184606
Monte San Pietrangeli FM 15 2458 187064
Campofilone FM 15 1916 188980
Magliano di Tenna FM 16 1452 190432
Montecosaro MC 16 7113 197545
Monte Giberto FM 16 801 198346
Grottazzolina FM 17 3398 201744
Montefiore dell'Aso AP 17 2123 203867
Massignano AP 17 1638 205505
Petritoli FM 17 2335 207840
Francavilla d'Ete FM 18 964 208804
Morrovalle MC 19 10195 218999
Montegiorgio FM 20 6851 225850

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km SE of Ancona (100861 inhabitants)
61 Km N of Teramo (54892 inhabitants)
83 Km NW of Montesilvano (53738 inhabitants)
90 Km E of Foligno (57155 inhabitants)
90 Km NW of Pescara (121014 inhabitants)
93 Km SE of Fano (60888 inhabitants)
99 Km NE of L'Aquila (69753 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 2.4
ML-VAX 1.9 		1987-10-24
18:31:17		 43.205 13.76 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 57559
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-24 18:31:17 ± 0.376
Latitude 43.2050 ± 0.0104
Longitude 13.7600 ± 0.0377
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 57559

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) 3270.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 197
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.00324
Epicentral distance of station farthest from the epicenter (degree) 0.01344
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 57559
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:11

ML:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 57559
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
--.SDI.Z. 1987-10-24T18:32:05.80 10.0 undecidable manual SN 178 1.4874 0.48 0.4
--.MNS.Z. 1987-10-24T18:31:57.20 10.0 undecidable manual SN 224 1.1322 0.34 0.6
--.AQU.Z. 1987-10-24T18:31:49.50 10.0 undecidable manual SG 197 0.8769 0.13 0.7
--.ASS.Z. 1987-10-24T18:31:48.36 10.0 undecidable manual SG 260 0.8214 1.23 0.1
--.SDI.Z. 1987-10-24T18:31:46.00 10.0 undecidable manual PN 178 1.4874 0.71 0.8
--.CRE.Z. 1987-10-24T18:31:45.00 10.0 undecidable manual PN 288 1.3764 1.32 0.2
--.ARV.Z. 1987-10-24T18:31:41.45 10.0 undecidable manual SG 296 0.6549 -0.59 0.5
--.MNS.Z. 1987-10-24T18:31:40.49 10.0 negative manual PN 224 1.1322 0.09 3.2
--.AQU.Z. 1987-10-24T18:31:35.50 10.0 undecidable manual PG 197 0.8769 -0.58 1.3
--.ALP.Z. 1987-10-24T18:31:35.60 10.0 undecidable manual SG 198 0.444 0.45 0.9
--.ASS.Z. 1987-10-24T18:31:34.15 10.0 undecidable manual PG 260 0.8214 -0.64 1.2
--.AM8.Z. 1987-10-24T18:31:32.51 10.0 undecidable manual SG 341 0.3552 0.49 0.9
--.ARV.Z. 1987-10-24T18:31:31.74 10.0 undecidable manual PG 296 0.6549 -0.11 1.9
--.CM8.Z. 1987-10-24T18:31:27.39 10.0 undecidable manual PG 268 0.444 -0.52 1.4
--.ALP.Z. 1987-10-24T18:31:26.89 10.0 undecidable manual PG 198 0.444 -0.98 0.6
--.AM8.Z. 1987-10-24T18:31:25.54 10.0 undecidable manual PG 341 0.3552 -0.52 1.4
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