ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.4 on date 23-02-1985 and time 18:50:38 (Italy) in region 9 km E Pizzoli (AQ)

A magnitude Md 2.4 earthquake occured in region: 9 km E Pizzoli (AQ), on

  • 23-02-1985 17:50:38 (UTC)
  • 23-02-1985 18:50:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.47, 13.4 at 9 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
Pizzoli AQ 9 4326 4326
Barete AQ 10 737 5063
Capitignano AQ 10 665 5728
Campotosto AQ 10 542 6270
Crognaleto TE 11 1297 7567
L'Aquila AQ 13 69753 77320
Pietracamela TE 14 271 77591
Montereale AQ 14 2581 80172
Cagnano Amiterno AQ 15 1369 81541
Fano Adriano TE 15 296 81837
Scoppito AQ 16 3727 85564
Cortino TE 19 656 86220
Poggio Picenze AQ 20 1136 87356

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km N of L'Aquila (69753 inhabitants)
33 Km SW of Teramo (54892 inhabitants)
62 Km W of Montesilvano (53738 inhabitants)
63 Km E of Terni (111501 inhabitants)
64 Km W of Chieti (51815 inhabitants)
67 Km W of Pescara (121014 inhabitants)
75 Km NE of Tivoli (56533 inhabitants)
76 Km NE of Guidonia Montecelio (88673 inhabitants)
79 Km SE of Foligno (57155 inhabitants)
99 Km NE of Roma (2864731 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 1985-02-23
17:50:38
42.47 13.4 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2299
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-23 17:50:38 ± 0.27
Latitude 42.47 ± 0.02
Longitude 13.40 ± 0.03
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2299

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) 2716.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00097
Epicentral distance of station farthest from the epicenter (degree) 0.00729
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:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 2299
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1985-02-23T17:51:06.50 10.0 undecidable manual SG 158 0.0073 -0.32 0.5
--.CM8.Z. 1985-02-23T17:51:06.10 10.0 undecidable manual SG 345 0.0067 1.42 0
--.AS1.Z. 1985-02-23T17:51:06.80 10.0 undecidable manual SG 317 0.0073 0.22 0.5
--.MNS.Z. 1985-02-23T17:50:57.50 10.0 undecidable manual SG 261 0.0048 -0.39 0.5
--.SD1.Z. 1985-02-23T17:50:55.30 10.0 undecidable manual PG 158 0.0073 0.43 1.1
--.AS1.Z. 1985-02-23T17:50:54.50 10.0 undecidable manual PG 317 0.0073 -0.23 1.3
--.CM8.Z. 1985-02-23T17:50:52.90 10.0 undecidable manual PG 345 0.0067 -0.73 1.3
--.PO9.Z. 1985-02-23T17:50:52.50 10.0 undecidable manual SG 287 0.0032 0.49 0.7
--.MNS.Z. 1985-02-23T17:50:49.00 10.0 undecidable manual PG 261 0.0048 -0.71 0.8
--.PO9.Z. 1985-02-23T17:50:47.00 10.0 undecidable manual PG 287 0.0032 0.69 0.9
--.AQU.Z. 1985-02-23T17:50:44.00 10.0 undecidable manual SG 180 0.001 0.02 1
--.AQU.Z. 1985-02-23T17:50:41.80 10.0 undecidable manual PG 180 0.001 0.12 3.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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