Earthquake with magnitude of Md 2.1 on date 24-04-1987 and time 12:49:10 (Italy) in region 3 km SE Gualdo Tadino (PG)

A magnitude Md 2.1 earthquake occured in region: 3 km SE Gualdo Tadino (PG), on

  • 24-04-1987 10:49:10 (UTC)
  • 24-04-1987 12:49:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.21, 12.8 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Gualdo Tadino PG 3 15208 15208
Fossato di Vico PG 10 2840 18048
Nocera Umbra PG 11 5839 23887
Fiuminata MC 11 1402 25289
Esanatoglia MC 13 2034 27323
Sefro MC 14 422 27745
Sigillo PG 14 2404 30149
Pioraco MC 16 1134 31283
Valfabbrica PG 17 3389 34672
Fabriano AN 17 31480 66152
Valtopina PG 17 1398 67550
Costacciaro PG 18 1216 68766
Matelica MC 18 9981 78747
Serravalle di Chienti MC 20 1070 79817
Cerreto d'Esi AN 20 3817 83634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km N of Foligno (57155 inhabitants)
35 Km E of Perugia (166134 inhabitants)
73 Km S of Fano (60888 inhabitants)
73 Km N of Terni (111501 inhabitants)
74 Km SW of Ancona (100861 inhabitants)
79 Km S of Pesaro (94582 inhabitants)
79 Km E of Arezzo (99543 inhabitants)
96 Km NW of Teramo (54892 inhabitants)
97 Km S of Rimini (147750 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 2.1 1987-04-24
10:49:10
43.21 12.8 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 45559
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-24 10:49:10 ± 0.16
Latitude 43.21 ± 0.01
Longitude 12.80 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 45559

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) 1957.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 164
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.00275
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 45559
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-04-24T10:49:22.80 10.0 undecidable manual SG 20 0.0028 0.44 0.6
--.CM8.Z. 1987-04-24T10:49:21.13 10.0 undecidable manual SG 92 0.0023 0.54 0.3
--.ASS.Z. 1987-04-24T10:49:18.00 10.0 undecidable manual SG 215 0.0016 -0.21 0.8
--.ARV.Z. 1987-04-24T10:49:17.00 10.0 undecidable manual PG 20 0.0028 -0.35 1.2
--.CM8.Z. 1987-04-24T10:49:15.97 10.0 undecidable manual PG 92 0.0023 -0.36 1.3
--.ASS.Z. 1987-04-24T10:49:15.20 10.0 undecidable manual PG 215 0.0016 0.24 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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