Earthquake with magnitude of Md 2.2 on date 28-10-1987 and time 06:02:49 (UTC) in region 2 km E Preci (PG)

A magnitude Md 2.2 earthquake occured in region: 2 km E Preci (PG), on

  • 28-10-1987 06:02:49 (UTC)
  • 28-10-1987 07:02:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.88, 13.06 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
Preci PG 2 724 724
Visso MC 6 1107 1831
Castelsantangelo sul Nera MC 8 281 2112
Ussita MC 9 444 2556
Norcia PG 10 4957 7513
Sellano PG 11 1079 8592
Monte Cavallo MC 13 145 8737
Cerreto di Spoleto PG 14 1075 9812
Fiordimonte MC 17 202 10014
Pieve Torina MC 18 1458 11472
Bolognola MC 18 142 11614
Cascia PG 19 3217 14831
Fiastra MC 19 559 15390
Acquacanina MC 19 121 15511
Pievebovigliana MC 20 866 16377

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
58 Km W of Teramo (54892 inhabitants)
60 Km E of Perugia (166134 inhabitants)
65 Km NW of L'Aquila (69753 inhabitants)
90 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 inhabitants)
98 Km W of Montesilvano (53738 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
ML-VAX 1.6
1987-10-28
06:02:49
42.88 13.06 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 57789
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-28 06:02:49 ± 0.187
Latitude 42.88 ± 0.01
Longitude 13.06 ± 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 57789

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) 1809
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.00688
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 57789
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:23

ML:1.6

Field Value
Value 1.6
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 57789
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
--.AM8.Z. 1987-10-28T06:03:17.90 10.0 undecidable manual SG 30 0.0069 1.26 0
--.ARV.Z. 1987-10-28T06:03:10.80 10.0 undecidable manual SG 352 0.0055 -0.17 0.5
--.MNS.Z. 1987-10-28T06:03:09.77 10.0 undecidable manual SG 209 0.0051 0.34 0.5
--.AM8.Z. 1987-10-28T06:03:05.59 10.0 undecidable manual PG 30 0.0069 1.04 0.2
--.ASS.Z. 1987-10-28T06:03:02.58 10.0 undecidable manual SG 300 0.0031 0.33 0.5
--.ALP.Z. 1987-10-28T06:03:02.96 10.0 undecidable manual SG 105 0.0034 -0.44 0.7
--.ARV.Z. 1987-10-28T06:03:01.50 10.0 undecidable manual PG 352 0.0055 -0.25 1.3
--.CM8.Z. 1987-10-28T06:03:00.45 10.0 undecidable manual SG 10 0.0028 -0.76 0.3
--.MNS.Z. 1987-10-28T06:03:00.56 10.0 undecidable manual PG 209 0.0051 -0.3 1.3
--.ALP.Z. 1987-10-28T06:02:57.54 10.0 undecidable manual PG 105 0.0034 0.16 1.5
--.ASS.Z. 1987-10-28T06:02:56.85 10.0 negative manual PG 300 0.0031 0.14 3.1
--.CM8.Z. 1987-10-28T06:02:55.65 10.0 negative manual PG 10 0.0028 -0.46 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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