Earthquake with magnitude of Md 2.3 on date 25-11-1987 and time 02:20:27 (Italy) in region 2 km W Porto Sant'Elpidio (FM)

A magnitude Md 2.3 earthquake occured in region: 2 km W Porto Sant'Elpidio (FM), on

  • 25-11-1987 01:20:27 (UTC)
  • 25-11-1987 02:20:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.26, 13.73 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.

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 Sant'Elpidio FM 3 26152 26152
Sant'Elpidio a Mare FM 5 17110 43262
Civitanova Marche MC 5 41983 85245
Monte Urano FM 8 8353 93598
Montegranaro FM 8 12990 106588
Montecosaro MC 10 7113 113701
Porto San Giorgio FM 10 16121 129822
Monte San Giusto MC 11 8191 138013
Fermo FM 11 37655 175668
Torre San Patrizio FM 13 2048 177716
Morrovalle MC 13 10195 187911
Monte San Pietrangeli FM 14 2458 190369
Potenza Picena MC 15 15936 206305
Rapagnano FM 16 2145 208450
Montelupone MC 16 3596 212046
Francavilla d'Ete FM 17 964 213010
Lapedona FM 17 1166 214176
Corridonia MC 18 15430 229606
Magliano di Tenna FM 18 1452 231058
Altidona FM 18 3390 234448
Ponzano di Fermo FM 19 1674 236122
Porto Recanati MC 19 12531 248653
Moresco FM 20 598 249251
Grottazzolina FM 20 3398 252649
Monterubbiano FM 20 2230 254879

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SE of Ancona (100861 inhabitants)
67 Km N of Teramo (54892 inhabitants)
86 Km SE of Fano (60888 inhabitants)
90 Km E of Foligno (57155 inhabitants)
90 Km NW of Montesilvano (53738 inhabitants)
97 Km NW of Pescara (121014 inhabitants)
98 Km SE of Pesaro (94582 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 2.3
ML-VAX 1.7
1987-11-25
01:20:27
43.26 13.73 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 58789
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-25 01:20:27 ± 0.596
Latitude 43.26 ± 0.02
Longitude 13.73 ± 0.04
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 58789

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) 4393.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 195
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00202
Epicentral distance of station farthest from the epicenter (degree) 0.01392
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 58789
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:56:14

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 58789
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 Takeoff_angle Residual Weight
--.MNS.Z. 1987-11-25T01:21:08.50 10.0 undecidable manual SN 221 0.0104 0.92 0.4
--.AQU.Z. 1987-11-25T01:21:00.94 10.0 undecidable manual SG 194 0.0084 0.36 0.6
--.SDI.Z. 1987-11-25T01:20:54.64 10.0 undecidable manual PN 177 0.0139 -1.08 0.7
--.ARV.Z. 1987-11-25T01:20:50.81 10.0 undecidable manual SG 292 0.0055 0.57 0.6
--.MNS.Z. 1987-11-25T01:20:49.89 10.0 undecidable manual PN 221 0.0104 -0.51 1.3
--.AQU.Z. 1987-11-25T01:20:48.38 10.0 undecidable manual PG 194 0.0084 1.76 0.4
--.CM8.Z. 1987-11-25T01:20:45.62 10.0 undecidable manual SG 260 0.0039 1.35 0.5
--.ARV.Z. 1987-11-25T01:20:40.42 10.0 undecidable manual PG 292 0.0055 -0.23 1.8
--.CM8.Z. 1987-11-25T01:20:35.92 10.0 negative manual PG 260 0.0039 -1.28 1.7
--.AM8.Z. 1987-11-25T01:20:35.11 10.0 undecidable manual PG 341 0.0027 0.8 1.4
--.MC8.Z. 1987-11-25T01:20:32.97 10.0 undecidable manual PG 277 0.002 0.27 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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