Earthquake with magnitude of Md 2.2 on date 16-12-1987 and time 02:20:56 (UTC) in region 8 km E Monteleone di Spoleto (PG)

A magnitude Md 2.2 earthquake occured in region: 8 km E Monteleone di Spoleto (PG), on

  • 16-12-1987 02:20:56 (UTC)
  • 16-12-1987 03:20:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.63, 13.04 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
Monteleone di Spoleto PG 8 599 599
Cittareale RI 10 482 1081
Leonessa RI 10 2435 3516
Cascia PG 10 3217 6733
Posta RI 12 694 7427
Poggiodomo PG 13 117 7544
Borbona RI 15 617 8161
Polino TR 17 233 8394
Accumoli RI 18 667 9061
Norcia PG 19 4957 14018
Poggio Bustone RI 19 2055 16073
Scheggino PG 20 461 16534
Micigliano RI 20 127 16661
Rivodutri RI 20 1253 17914

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Terni (111501 inhabitants)
42 Km NW of L'Aquila (69753 inhabitants)
46 Km SE of Foligno (57155 inhabitants)
54 Km W of Teramo (54892 inhabitants)
75 Km NE of Guidonia Montecelio (88673 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
77 Km N of Tivoli (56533 inhabitants)
80 Km E of Viterbo (67173 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
94 Km NE of Roma (2864731 inhabitants)
97 Km W of Chieti (51815 inhabitants)
98 Km W of Pescara (121014 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 2.2 1987-12-16
02:20:56
42.63 13.04 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 59649
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-12-16 02:20:56 ± 0.239
Latitude 42.63 ± 0.01
Longitude 13.04 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 59649

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) 2057.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00324
Epicentral distance of station farthest from the epicenter (degree) 0.00971
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 59649
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:56:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-12-16T02:21:27.50 10.0 undecidable manual SG 354 0.0078 0.22 0.5
--.SDI.Z. 1987-12-16T02:21:19.83 10.0 undecidable manual PN 147 0.0097 1.74 0.1
--.CM8.Z. 1987-12-16T02:21:17.57 10.0 undecidable manual SG 7 0.0051 0 0.8
--.ASS.Z. 1987-12-16T02:21:16.11 10.0 undecidable manual SG 326 0.0046 0.15 0.7
--.ARV.Z. 1987-12-16T02:21:14.50 10.0 undecidable manual PG 354 0.0078 0.26 1.5
--.ALP.Z. 1987-12-16T02:21:11.68 10.0 undecidable manual SG 68 0.0036 -0.72 0.2
--.MNS.Z. 1987-12-16T02:21:10.29 10.0 undecidable manual SG 227 0.0032 -0.2 0.5
--.CM8.Z. 1987-12-16T02:21:08.57 10.0 undecidable manual PG 7 0.0051 -0.06 1.9
--.ASS.Z. 1987-12-16T02:21:07.50 10.0 undecidable manual PG 326 0.0046 -0.2 1.8
--.ALP.Z. 1987-12-16T02:21:05.51 10.0 undecidable manual PG 68 0.0036 -0.13 1.6
--.MNS.Z. 1987-12-16T02:21:04.40 10.0 undecidable manual PG 227 0.0032 -0.14 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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