Earthquake with magnitude of Md 2.3 on date 07-07-1985 and time 23:28:04 (Italy) in region 3 km NW Amatrice (RI)

A magnitude Md 2.3 earthquake occured in region: 3 km NW Amatrice (RI), on

  • 07-07-1985 21:28:04 (UTC)
  • 07-07-1985 23:28:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.65, 13.28 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
Amatrice RI 3 2657 2657
Accumoli RI 5 667 3324
Cittareale RI 10 482 3806
Campotosto AQ 13 542 4348
Arquata del Tronto AP 13 1178 5526
Montereale AQ 15 2581 8107
Capitignano AQ 15 665 8772
Acquasanta Terme AP 17 2916 11688
Cortino TE 19 656 12344
Borbona RI 20 617 12961

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km N of L'Aquila (69753 inhabitants)
35 Km W of Teramo (54892 inhabitants)
52 Km E of Terni (111501 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
81 Km W of Chieti (51815 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
86 Km NE of Tivoli (56533 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
99 Km E 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 2.3 1985-07-07
21:28:04
42.65 13.28 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 9769
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-07-07 21:28:04 ± 0.252
Latitude 42.65 ± 0.02
Longitude 13.28 ± 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 9769

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) 2854.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 192
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
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) 0.00219
Epicentral distance of station farthest from the epicenter (degree) 0.0055
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 9769
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:13:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AS1.Z. 1985-07-07T21:28:25.00 10.0 undecidable manual SG 312 0.0055 -0.73 0.1
--.CM2.Z. 1985-07-07T21:28:23.90 10.0 undecidable manual SG 350 0.0049 0.26 0.6
--.AS1.Z. 1985-07-07T21:28:18.00 10.0 undecidable manual PG? 312 0.0055 1.38 0
--.CM2.Z. 1985-07-07T21:28:15.10 10.0 undecidable manual PG 350 0.0049 -0.31 0.9
--.ALP.Z. 1985-07-07T21:28:14.30 10.0 undecidable manual SG 59 0.0022 0.22 0.7
--.PO9.Z. 1985-07-07T21:28:14.50 10.0 undecidable manual SG 252 0.0023 0.15 0.5
--.PO9.Z. 1985-07-07T21:28:10.00 10.0 positive manual PG 252 0.0023 -0.05 2.7
--.ALP.Z. 1985-07-07T21:28:09.80 10.0 positive manual PG 59 0.0022 -0.09 2.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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