Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 31-10-1998 and time 17:15:36 (Italy) in region 4 km NE Ragalna (CT)

A magnitude Md 2.5 earthquake occured in region: 4 km NE Ragalna (CT), on

  • 31-10-1998 16:15:36 (UTC)
  • 31-10-1998 17:15:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6520, 14.9810 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ragalna CT 4 3924 3924
Nicolosi CT 6 7463 11387
Belpasso CT 7 28108 39495
Pedara CT 8 14102 53597
Santa Maria di Licodia CT 9 7641 61238
Trecastagni CT 10 10910 72148
Camporotondo Etneo CT 10 5023 77171
San Pietro Clarenza CT 10 7743 84914
Biancavilla CT 10 24007 108921
Paternò CT 11 48228 157149
Mascalucia CT 11 31958 189107
Viagrande CT 11 8563 197670
Tremestieri Etneo CT 12 20589 218259
Zafferana Etnea CT 12 9517 227776
Gravina di Catania CT 12 25838 253614
Aci Bonaccorsi CT 13 3524 257138
San Giovanni la Punta CT 13 23060 280198
Adrano CT 13 36122 316320
Sant'Agata li Battiati CT 14 9479 325799
Aci Sant'Antonio CT 14 17984 343783
Milo CT 14 1087 344870
Santa Venerina CT 15 8592 353462
Misterbianco CT 15 49410 402872
San Gregorio di Catania CT 15 11966 414838
Valverde CT 15 7840 422678
Aci Catena CT 15 29851 452529
Motta Sant'Anastasia CT 16 12116 464645
Acireale CT 17 52622 517267
Sant'Alfio CT 18 1582 518849
Aci Castello CT 18 18723 537572
Catania CT 19 314555 852127
Bronte CT 20 19172 871299

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km W of Acireale (52622 inhabitants)
19 Km NW of Catania (314555 inhabitants)
71 Km NW of Siracusa (122291 inhabitants)
77 Km SW of Reggio di Calabria (183035 inhabitants)
79 Km SW of Messina (238439 inhabitants)
83 Km E of Caltanissetta (63360 inhabitants)
84 Km N of Ragusa (73313 inhabitants)
87 Km NE of Vittoria (63339 inhabitants)
90 Km N of Modica (54633 inhabitants)
92 Km NE of Gela (75827 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
Bulletin
Rev1000 		Md 2.5
ML-VAX 2.0 		1998-10-31
16:15:36		 37.652 14.981 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 354299
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1998-10-31 16:15:36 ± 0.149
Latitude 37.6520 ± 0.0078
Longitude 14.9810 ± 0.0144
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 354299

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) 1539.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 128
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.00324
Epicentral distance of station farthest from the epicenter (degree) 0.00850
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 354299
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:32:05

ML:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 5
Type of magnitude ML
Reference to an origin 354299
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SOI.Z. 1998-10-31T16:16:09.54 10.0 undecidable manual SG 63 0.9435 0.09 0.6
--.MO9.Z. 1998-10-31T16:16:01.45 10.0 undecidable manual SG 57 0.6549 1.1 0
--.PZI.Z. 1998-10-31T16:15:58.43 10.0 undecidable manual SG 182 0.5883 0.21 0.7
--.MEU.Z. 1998-10-31T16:15:57.35 10.0 undecidable manual SG 192 0.5439 0.51 0.4
--.SOI.Z. 1998-10-31T16:15:55.54 10.0 undecidable manual PG 63 0.9435 0.14 1.4
--.AU9.Z. 1998-10-31T16:15:53.75 10.0 undecidable manual SG 154 0.444 0.52 0.4
--.MNO.Z. 1998-10-31T16:15:50.95 10.0 undecidable manual SG 321 0.3552 0.75 0.2
--.MO9.Z. 1998-10-31T16:15:50.40 10.0 undecidable manual PG 57 0.6549 -0.11 1.8
--.PZI.Z. 1998-10-31T16:15:48.62 10.0 undecidable manual PG 182 0.5883 -0.29 1.6
--.ATN.Z. 1998-10-31T16:15:48.76 10.0 undecidable manual PG 36 0.6327 -0.83 0.3
--.MEU.Z. 1998-10-31T16:15:47.93 10.0 undecidable manual PG 192 0.5439 -0.19 1.8
--.AU9.Z. 1998-10-31T16:15:45.93 10.0 undecidable manual PG 154 0.444 -0.11 1.9
--.MNO.Z. 1998-10-31T16:15:44.28 10.0 undecidable manual PG 321 0.3552 0 2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download