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130 هزة أرضية منذ عام 2008.. هل التنقيب عن الوقود الصخري وراء الزلازل بتكساس؟

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130 هزة أرضية منذ عام 2008.. هل التنقيب عن الوقود الصخري وراء الزلازل بتكساس؟
Credit: MIRCEA RESTEA/AFP/Getty Images

تكساس، الولايات المتحدة الأمريكية (CNN) -- قال علماء إن عمليات التنقيب عن الوقود الصخري في تكساس ربما تكون وراء ظاهرة النشاط الزلزالي المتزايد بالولاية حيث ضربت مناطقها  الشمالية أكثر من 130 هزة أرضية منذ عام 2008، مقابل واحدة فقط خلال الخمسين عاما السابقة لذلك.

وفيما يرى "مركز مسح الزلازل الأمريكي" عدم وجود رابط مؤكد ووثيق مع النشاط البشري، رجح خبراء من جامعة "ساوثرن مثوديثت" مسؤولية عمليات التنقيب عن الوقود الصخري المعروفة بـ"فراكين" عن عدة هزات أرضية شهدتها مناطق محددة شمال شرقي الولاية أواخر عام 2013 و 2014.

وقالت رئيسة الباحثين بجامعة "ساوثرن مثوديثت، هيزر دشيون: "فيما تظل هناك بعض الشكوك، فأنه من غير المحتمل أن الزيادات الطبيعية للضغوط التكتونية أدت إلى هذه الأحداث"

وبحسب وكالة المسح الأمريكي شهدت مناطق دلاس قرابة 40 هزة أرضية صغيرة بقوة 2 درجة بمقياس ريختر أو أكثر" منذ بداية العام.

ورجح الخبير بمركز المسح الجيولوجي الأمريكي، جورج شوي، مسؤولية المياه أو السوائل التي يجري ضخها بضغط عال تحت قشرة الأرض أثناء إنتاج الوقود الصخري، وراء سلسلة الهزات الأرضية، لكنه استدرك بقوله: "الاستنتاج ليس بقاطع ولكن لا يمكن استبعاده في ذات الوقت."