Earthquake with magnitude of Md 2.4 on date 27-03-1985 and time 01:33:33 (UTC) in region 6 km SE Arquata del Tronto (AP)

A magnitude Md 2.4 earthquake occured in region: 6 km SE Arquata del Tronto (AP), on

  • 27-03-1985 01:33:33 (UTC)
  • 27-03-1985 02:33:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.74, 13.35 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
Arquata del Tronto AP 6 1178 1178
Acquasanta Terme AP 6 2916 4094
Accumoli RI 10 667 4761
Montegallo AP 11 523 5284
Valle Castellana TE 12 977 6261
Amatrice RI 13 2657 8918
Rocca Santa Maria TE 16 537 9455
Roccafluvione AP 17 2010 11465
Montemonaco AP 18 604 12069
Cortino TE 19 656 12725
Venarotta AP 20 2066 14791
Palmiano AP 20 196 14987

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km W of Teramo (54892 inhabitants)
44 Km N of L'Aquila (69753 inhabitants)
58 Km E of Foligno (57155 inhabitants)
61 Km E of Terni (111501 inhabitants)
70 Km W of Montesilvano (53738 inhabitants)
77 Km W of Pescara (121014 inhabitants)
80 Km NW of Chieti (51815 inhabitants)
88 Km E of Perugia (166134 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km NE of Tivoli (56533 inhabitants)
98 Km S of Ancona (100861 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 2.4 1985-03-27
01:33:33
42.74 13.35 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 3709
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-27 01:33:33 ± 0.628
Latitude 42.74 ± 0.02
Longitude 13.35 ± 0.06
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3709

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) 5197.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 195
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) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00308
Epicentral distance of station farthest from the epicenter (degree) 0.00729
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 3709
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-03-27T01:34:01.50 10.0 undecidable manual SG 338 0.0073 0.01 0.6
--.MNS.Z. 1985-03-27T01:33:54.00 10.0 undecidable manual SG 234 0.0054 -0.94 0.4
--.AS1.Z. 1985-03-27T01:33:52.50 10.0 undecidable manual SG 302 0.0054 -2.27 0
--.AR1.Z. 1985-03-27T01:33:49.50 10.0 undecidable manual PG 338 0.0073 -0.16 1.5
--.PO9.Z. 1985-03-27T01:33:46.00 10.0 undecidable manual SG 241 0.0031 -0.45 0.6
--.AS1.Z. 1985-03-27T01:33:46.50 10.0 undecidable manual PG 302 0.0054 0.73 1.3
--.MNS.Z. 1985-03-27T01:33:45.50 10.0 undecidable manual PG 234 0.0054 -0.38 1.6
--.PO9.Z. 1985-03-27T01:33:42.00 10.0 positive manual PG 241 0.0031 1.03 1.8
--.AQU.Z. 1985-03-27T01:33:41.00 10.0 undecidable manual PG 174 0.0035 -0.82 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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