Earthquake with magnitude of Md 2.3 on date 21-08-1985 and time 09:15:32 (Italy) in region 3 km E Offida (AP)

A magnitude Md 2.3 earthquake occured in region: 3 km E Offida (AP), on

  • 21-08-1985 07:15:32 (UTC)
  • 21-08-1985 09:15:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.94, 13.73 at 5 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
Offida AP 3 5058 5058
Castorano AP 5 2380 7438
Cossignano AP 6 978 8416
Ripatransone AP 7 4309 12725
Acquaviva Picena AP 7 3831 16556
Spinetoli AP 7 7215 23771
Appignano del Tronto AP 7 1785 25556
Monsampolo del Tronto AP 7 4611 30167
Colli del Tronto AP 7 3668 33835
Castel di Lama AP 8 8634 42469
Castignano AP 9 2796 45265
Monteprandone AP 9 12655 57920
Carassai AP 11 1100 59020
Montalto delle Marche AP 11 2122 61142
Ancarano TE 12 1857 62999
Montedinove AP 12 488 63487
Montefiore dell'Aso AP 12 2123 65610
Controguerra TE 12 2436 68046
Grottammare AP 13 16006 84052
San Benedetto del Tronto AP 13 47303 131355
Maltignano AP 13 2401 133756
Sant'Egidio alla Vibrata TE 13 9811 143567
Massignano AP 13 1638 145205
Rotella AP 14 906 146111
Ortezzano FM 14 774 146885
Colonnella TE 14 3734 150619
Torano Nuovo TE 14 1611 152230
Cupra Marittima AP 14 5398 157628
Monte Vidon Combatte FM 14 433 158061
Petritoli FM 15 2335 160396
Monte Rinaldo FM 15 379 160775
Nereto TE 16 5242 166017
Corropoli TE 16 5045 171062
Folignano AP 16 9241 180303
Monterubbiano FM 16 2230 182533
Moresco FM 16 598 183131
Ascoli Piceno AP 16 49407 232538
Martinsicuro TE 17 16033 248571
Campofilone FM 17 1916 250487
Montottone FM 18 979 251466
Montelparo FM 18 778 252244
Monte Giberto FM 18 801 253045
Sant'Omero TE 18 5243 258288
Ponzano di Fermo FM 19 1674 259962
Lapedona FM 19 1166 261128
Altidona FM 19 3390 264518
Force AP 19 1354 265872
Pedaso FM 20 2800 268672
Civitella del Tronto TE 20 5116 273788
Monsampietro Morico FM 20 659 274447
Alba Adriatica TE 20 12353 286800
Monteleone di Fermo FM 20 395 287195

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km N of Teramo (54892 inhabitants)
59 Km NW of Montesilvano (53738 inhabitants)
66 Km NW of Pescara (121014 inhabitants)
71 Km NE of L'Aquila (69753 inhabitants)
75 Km NW of Chieti (51815 inhabitants)
77 Km S of Ancona (100861 inhabitants)
83 Km E of Foligno (57155 inhabitants)
98 Km E of Terni (111501 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 1985-08-21
07:15:32
42.94 13.73 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 12169
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-21 07:15:32 ± 0.66
Latitude 42.94 ± 0.01
Longitude 13.73 ± 0.05
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 12169

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) 3930.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 275
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
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) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00615
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 12169
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM2.Z. 1985-08-21T07:15:51.40 10.0 undecidable manual SG 300 0.0045 0.18 0.9
--.PO9.Z. 1985-08-21T07:15:47.50 10.0 undecidable manual PG 237 0.0062 0.68 0.4
--.CM2.Z. 1985-08-21T07:15:42.90 10.0 undecidable manual PG 300 0.0045 -0.39 1
--.ALP.Z. 1985-08-21T07:15:40.20 10.0 undecidable manual SG 215 0.0018 -0.24 0.7
--.ALP.Z. 1985-08-21T07:15:37.10 10.0 undecidable manual PG 215 0.0018 0.04 1.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download