Earthquake with magnitude of Md 2.8 on date 28-07-1986 and time 11:54:38 (Italy) in region 2 km NE Posta (RI)

A magnitude Md 2.8 earthquake occured in region: 2 km NE Posta (RI), on

  • 28-07-1986 09:54:38 (UTC)
  • 28-07-1986 11:54:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.54, 13.12 at 8 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
Posta RI 2 694 694
Borbona RI 3 617 1311
Cittareale RI 10 482 1793
Micigliano RI 11 127 1920
Montereale AQ 11 2581 4501
Leonessa RI 13 2435 6936
Cagnano Amiterno AQ 13 1369 8305
Antrodoco RI 14 2588 10893
Capitignano AQ 15 665 11558
Borgo Velino RI 15 972 12530
Barete AQ 17 737 13267
Castel Sant'Angelo RI 17 1308 14575
Amatrice RI 18 2657 17232
Monteleone di Spoleto PG 18 599 17831
Pizzoli AQ 19 4326 22157
Cantalice RI 19 2755 24912
Poggio Bustone RI 19 2055 26967

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of L'Aquila (69753 inhabitants)
38 Km E of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
68 Km NE of Guidonia Montecelio (88673 inhabitants)
69 Km NE of Tivoli (56533 inhabitants)
84 Km E of Viterbo (67173 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
87 Km SE of Perugia (166134 inhabitants)
89 Km NE of Roma (2864731 inhabitants)
89 Km W of Chieti (51815 inhabitants)
91 Km W of Pescara (121014 inhabitants)
99 Km N of Velletri (53303 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 2.8 1986-07-28
09:54:38
42.54 13.12 8 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 31729
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-07-28 09:54:38 ± 0.275
Latitude 42.54 ± 0.01
Longitude 13.12 ± 0.03
Depth (km) 8 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 31729

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) 2362.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 138
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
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) 0.00251
Epicentral distance of station farthest from the epicenter (degree) 0.0123
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:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 31729
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:32:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1986-07-28T09:55:12.00 10.0 undecidable manual SG 352 0.0087 0.15 0.4
--.CRE.Z. 1986-07-28T09:55:04.00 10.0 undecidable manual PN 322 0.0123 0.29 0.6
--.ASS.Z. 1986-07-28T09:55:01.00 10.0 undecidable manual SG 327 0.0056 0.19 0.5
--.ARV.Z. 1986-07-28T09:54:57.00 10.0 undecidable manual PG 352 0.0087 -0.72 0.1
--.RDP.Z. 1986-07-28T09:54:55.00 10.0 undecidable manual PG 201 0.0074 -0.23 1.1
--.MNS.Z. 1986-07-28T09:54:52.00 10.0 undecidable manual SG 244 0.0032 -0.18 0.8
--.ASS.Z. 1986-07-28T09:54:51.50 10.0 undecidable manual PG 327 0.0056 0.16 1.3
--.MNS.Z. 1986-07-28T09:54:46.50 10.0 positive manual PG 244 0.0032 0.14 2.8
--.AQU.Z. 1986-07-28T09:54:45.00 10.0 undecidable manual PG 131 0.0025 0.16 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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