Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 06-10-1987 and time 05:58:08 (Italy) in region 1 km SW Micigliano (RI)

A magnitude Md 2.1 earthquake occured in region: 1 km SW Micigliano (RI), on

  • 06-10-1987 04:58:08 (UTC)
  • 06-10-1987 05:58:08 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.4490, 13.0500 at 7 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Micigliano RI 1 127 127
Antrodoco RI 4 2588 2715
Borgo Velino RI 5 972 3687
Castel Sant'Angelo RI 6 1308 4995
Posta RI 9 694 5689
Borbona RI 10 617 6306
Cittaducale RI 11 6828 13134
Cantalice RI 12 2755 15889
Leonessa RI 14 2435 18324
Cagnano Amiterno AQ 15 1369 19693
Poggio Bustone RI 15 2055 21748
Concerviano RI 15 291 22039
Rieti RI 16 47698 69737
Petrella Salto RI 17 1197 70934
Rivodutri RI 18 1253 72187
Montereale AQ 18 2581 74768
Barete AQ 19 737 75505
Scoppito AQ 19 3727 79232
Belmonte in Sabina RI 19 636 79868
Morro Reatino RI 20 373 80241

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km W of L'Aquila (69753 inhabitants)
35 Km E of Terni (111501 inhabitants)
57 Km NE of Guidonia Montecelio (88673 inhabitants)
58 Km NE of Tivoli (56533 inhabitants)
59 Km W of Teramo (54892 inhabitants)
63 Km SE of Foligno (57155 inhabitants)
77 Km NE of Roma (2864731 inhabitants)
78 Km E of Viterbo (67173 inhabitants)
88 Km N of Velletri (53303 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
91 Km SE of Perugia (166134 inhabitants)
93 Km W of Chieti (51815 inhabitants)
96 Km W of Pescara (121014 inhabitants)
98 Km NE of Pomezia (62966 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
Bulletin
Rev1000 		Md 2.1
ML-VAX 1.8 		1987-10-06
04:58:08		 42.449 13.05 7 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 56559
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-06 04:58:08 ± 0.265
Latitude 42.4490 ± 0.0130
Longitude 13.0500 ± 0.0182
Depth (km) 7 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 56559

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) 2075.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.00939
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 56559
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:54:18

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 56559
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(km) Takeoff_angle Residual Weight
--.ARV.Z. 1987-10-06T04:58:44.30 10.0 undecidable manual SG 355 1.0434 -0.05 0.5
--.CM8.Z. 1987-10-06T04:58:35.33 10.0 undecidable manual SG 4 0.7437 0.72 0.3
--.ASS.Z. 1987-10-06T04:58:33.23 10.0 undecidable manual SG 334 0.6771 0.85 0.1
--.CP9.Z. 1987-10-06T04:58:30.76 10.0 undecidable manual SG 186 0.5883 1.17 0
--.ARV.Z. 1987-10-06T04:58:28.50 10.0 undecidable manual PG 355 1.0434 -0.53 0.7
--.ALP.Z. 1987-10-06T04:58:26.96 10.0 undecidable manual SG 48 0.4995 0.18 0.9
--.CM8.Z. 1987-10-06T04:58:23.21 10.0 undecidable manual PG 4 0.7437 -0.19 1.4
--.ASS.Z. 1987-10-06T04:58:22.24 10.0 undecidable manual PG 334 0.6771 0.13 1.5
--.RMP.Z. 1987-10-06T04:58:22.00 10.0 undecidable manual PG 201 0.6882 -0.28 1.3
--.MNS.Z. 1987-10-06T04:58:19.19 10.0 undecidable manual SG 256 0.2775 0.07 0.6
--.CP9.Z. 1987-10-06T04:58:19.78 10.0 undecidable manual PG 186 0.5883 -0.72 0.5
--.ALP.Z. 1987-10-06T04:58:18.56 10.0 positive manual PG 48 0.4995 -0.32 2.6
--.AQU.Z. 1987-10-06T04:58:15.20 10.0 undecidable manual PG 109 0.2664 0.81 0.4
--.MNS.Z. 1987-10-06T04:58:14.56 10.0 positive manual PG 256 0.2775 0.11 3.2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download