Earthquake with magnitude of Md 2.1 on date 23-04-1987 and time 16:48:03 (Italy) in region 4 km W Serravalle di Chienti (MC)

A magnitude Md 2.1 earthquake occured in region: 4 km W Serravalle di Chienti (MC), on

  • 23-04-1987 14:48:03 (UTC)
  • 23-04-1987 16:48:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.08, 12.9 at 25 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
Serravalle di Chienti MC 4 1070 1070
Sefro MC 8 422 1492
Nocera Umbra PG 9 5839 7331
Muccia MC 12 915 8246
Fiuminata MC 12 1402 9648
Valtopina PG 12 1398 11046
Pioraco MC 13 1134 12180
Monte Cavallo MC 13 145 12325
Pieve Torina MC 13 1458 13783
Camerino MC 15 6974 20757
Pievebovigliana MC 15 866 21623
Fiordimonte MC 16 202 21825
Gualdo Tadino PG 19 15208 37033
Esanatoglia MC 19 2034 39067
Castelraimondo MC 19 4587 43654

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NE of Foligno (57155 inhabitants)
42 Km E of Perugia (166134 inhabitants)
62 Km NE of Terni (111501 inhabitants)
78 Km SW of Ancona (100861 inhabitants)
81 Km NW of Teramo (54892 inhabitants)
85 Km S of Fano (60888 inhabitants)
91 Km NW of L'Aquila (69753 inhabitants)
92 Km S of Pesaro (94582 inhabitants)
93 Km E of Arezzo (99543 inhabitants)
99 Km NE of Viterbo (67173 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 1987-04-23
14:48:03
43.09 12.9 25 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 45459
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-23 14:48:03 ± 0.464
Latitude 43.09 ± 0.02
Longitude 12.90 ± 0.02
Depth (km) 25 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 45459

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) 2549.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 204
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.00372
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 45459
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-04-23T14:48:20.00 10.0 undecidable manual SG 4 0.0037 0.4 0.2
--.CM8.Z. 1987-04-23T14:48:13.99 10.0 undecidable manual SG 58 0.0019 0.01 0.9
--.ASS.Z. 1987-04-23T14:48:13.00 10.0 undecidable manual SG 262 0.0016 -0.41 0.3
--.ARV.Z. 1987-04-23T14:48:12.50 10.0 undecidable manual PG 4 0.0037 -0.29 1
--.ASS.Z. 1987-04-23T14:48:09.50 10.0 undecidable manual PG 262 0.0016 0.29 1.3
--.CM8.Z. 1987-04-23T14:48:09.53 10.0 undecidable manual PG 58 0.0019 -0.01 2.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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